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has-gilgamesh-doneanythingwrong · 11 months

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nsfw headcannons with Cu~? (≧∀≦) hope you have a wonderful day~!

Hi anon, thanks; you too!!! Well, as my queue is permanently closed, I'm not really taking requests anymore... But I guess I can share a few general NSFW Cu headcanons. Some headcanons I have may be more popular than others, but I hope they will be enjoyable to read regardless. I've kept all situations with a partner gender-neutral as well!

Hope you enjoy... These will be tagged as 'lemon fanfic' and there won't be any explicit content however it will likely be 18+.

Warning: depictions of a sexual nature and mentions of kinks/ possible bedroom interactions, temperature play, outdoor sex, oral...

As you haven't specified a Cu, I will write for all four!!! (in my personal belief Proto is 18+ so he'll be included as well. These may be long...)

Fate Series Cu Chulainn (Proto, Lancer, Caster, Alter)-General NSFW Headcanons

Proto Cu

As a Cu that seems even more intent on proving his worth than the others, I headcanon that he would possibly the type to go way out of his way to impact his partner as much as possible during sex. Like the kind of guy that will pull out as many stops as possible to make them melt beneath his touch (but then gets extremely carried away at some point, losing himself to the moment).

He does seem like the kind of guy to really indulge in the touch and sensations of his partner, however Proto Cu does also strike me as being pretty insecure sometimes as well. So sometimes he may try to play it cool at first, or may prefer sex with clothes on (until he gets really into it).

He's also depicted as a bit wilder and more unrestrained than the other Cu, and has a very restless vibe in my personal opinion. So I can imagine him getting a bit wild in the bedroom; via biting, pouncing etc. I bet he'd likely be the guy to pull out the claws, as well as feel great pleasure from having his partner's hands digging into his skin.

He'd likely enjoy as much simulation as possible, so would love if his partner touches him openly as well. He would want to feel them too, and would relish in them openly exploring his body. Let him know just how much you desire him.

On the reverse, this means planned foreplay will likely unravel very quickly- because Proto would likely get extremely hot under the collar, and lose track of himself. I guess this means that it could get a bit rough, but then in the myths they say he is a lover that knows how to attend to their partners' needs, so it may not get too intense.

He's cocky as hell, that's for certain. Just like on the battlefield, he most likely has trained in the arts of sex as well. If you praise him, he'll likely eat your adulation RIGHT UP and then push himself to please you even more, yearning for even more of your adoring words.

Despite this, as he's shown to warm up extremely quickly to the master in his 'my room' lines, and can be really affectionate; I believe he may also be a massive softie as well. I think he also has the potential to be a huge romantic in terms of NSFW, and would definitely enjoy a tender time together as well!!

Though as he's Proto, he may be a bit shy with the tender words at first; but seeing as he's the guy who still holds on dearly to his Gae Bolg replica from Prototype, as well as still speaking very fondly of his time in the Land of Shadows with Scathach- you bet that this guy's heart would likely be bursting with a lot of feelings.

As for kinks, I am unsure- this guy seems really open to many things. But as he also enjoys the thrill of battle, I have a feeling he'd get really excited from some combat-style stuff. I think he may be a lil bit freaky.

Kinks that can evoke a thrill, that makes his veins thrum with adrenaline-setting him off with deep desire. I think he loves that kind of simulation.

I once read a post that details Proto as the kind of guy who'd cook a nice breakfast after a passionate one-night stand, and I can also imagine that happening. I can also imagine there would be space for joy and laughter as well as some occasional random moments, so he'd be pretty fun overall!

Lancer Cu

Overall, I'd say he is pretty similar to Proto. But the major difference here is that Lancer gives the impression of being way more comfortable in his own skin than Proto is. He knows how fucking hot he is, and has the pride and ability to work a room (though he can also be extremely crude as well).

Lancer is proud of who he is, and isn't afraid to show it- so he'd be totally up for showing off to the utmost.

His flirting game would be a powerful entrée to set the mood. Be prepared for flirts that range from cute, affectionate and pretty complimentary of your skills and positive traits- to downright horny and even extremely blatant (he may be smooth, but personally I feel like Lancer sometimes also gets extremely carried away).

However, I believe that Lancer is a serious romantic. It seems to bring him great pleasure to commit Acts of Service by doing as much as possible for those he cares for, like a 'big brother' type.

I guess in a NSFW setting this means he'll attend to your needs and make you feel safe and comfy during some very attentive sex??

He may also be very easy to wrap around your fingers as well. He may very well bend his knees to your words of praise, desperately grasping for more.

Tell him just how good he feels, what you think about him... it'll give him a real boost, and maybe make him blush too. As the type who loves putting on a show- and who loves it even more when his heroic acts are admired and adored- admiring touches and words will have him whipped like an errant knight serving their lord.

On the other hand, he also loves a challenge; so may not be entirely adverse to being ordered around a little- especially if the demands are hot!

This one is probably also open to a lot of different kinds of sex and kinks, so there's a lot of options to play around with (ranging from tame to hardcore).

Lancer doesn't seem that judgmental when it comes to sexual desire, and whether a partner is experienced or a shy newbie, he'll be happy to take the reins- or let you pull him a little by the collar- if you dare to handle him, of course.

That doesn't mean he isn't intense though. Lancer is also very emotional, and will very likely fully invest himself into the moment. In a sentimental sense, that likely means he will bless you with praise and compliments, as well as endowing you with beautiful terms of endearment in his native language.

In a horny sense though... watch out. You may be at it all night, in all sorts of ways. If things are feeling good, then he'll indulge in the moment with you for as long as possible.

If things get a little heated, or even competitive- such as fighting for dominance, or really going at one another- then he'll battle back with his utmost. If you want to render him to paste beneath your luxurious touch, Lancer will make you work for it. He likes the competition.

Lancer will remember exactly what turns you on, and is a very perceptive warrior; so though he may not always read the finer details, he'll be able to gauge how you're feeling or know exactly where to set you off- so be prepared for one heck of an experience.

"Do heroes give head?!" The debate continues. Sure, I bet he'd enjoy receiving some oral, tightly weaving his hands around the easiest part of his partner that he can access.

However, in my opinion- who knows? He may return the favor every now and then, pouring his all servicing a partner; and enjoying the way in which they unravel before his sumptuous fingers and tongue.

On a last note though, I do think there are aspects of Lancer that can be very deeply sentimental at times; as well as moments in which his more sorrowful aspects may rise to the surface.

There may be moments where he completely unravels his outer face of peerless confidence before a partner and unleashes the vulnerability resting within, and may just wish to bury himself within another's warmth, whiling away the painful hours by another's side.

Caster Cu

Caster Cu is also very similar to Proto and Lancer in terms of NSFW headcanons (im sorry im just repeating this for all of them). However, to me personally, Caster Cu's air of mystery and emotional distance is much stronger than Proto and Lancer's. This man is like a wizard's maze, boasting many different aspects to his character.

As he's older, the flirting game is even more deadly. He likely has a tough repertoire by this stage, able to set even the steeliest of hearts aflutter (or serve as a very humorous and interesting guy to banter with at the very least).

Due to his role serving as a form of guidance towards Mash and the Master- as well as certain lb6.5 spoilers that reveal the reason as to why he has adopted a role that is so strongly defined by wisdom- he is likely to have a more mature edge to him.

This doesn't mean that he's immune from 'silly time' though.

This means that he'll be a comfy guy for someone who is a bit new to sex or someone who is nervous, as he can consistently guide them along; constantly adjusting to their changing pace and needs.

However, he does seem to give off the impression of being rather tired (are those bags under his eyes?), so he may have a bit less stamina. Or maybe more. Caster Cu is very unpredictable in my opinion, however I can imagine him complaining of pains in his joints and of aching muscles, so some kinks may be a bit more exhausting for him to pull off.

That doesn't mean that he's not up for some adventure though! Now he's got all the time in the world to explore nature, get prepared for an exciting bevy of locations.

From the forest, the great outdoors; to even under a waterfall- he doesn't strike me as the kind of guy to have any shame about where he'd indulge within a good time.

Thanks to his mastery over the runes, Caster is your ultimate guy for temperature play. A little bit of ice from the Isa rune there, and a comforting fire from runes such as the Kenaz one make for a very titillating time.

Rotating between heating and cooling the parts of your body that yearn for him, as well as even as going far as to change the temperature of his body as he works his way through- you'll be bound to melt beneath his touch.

Plant sex with the runes is also an option. Making sure to remain careful enough not to hurt you with his vines, yet also tightening the pressure enough for your face to lax with bliss, he fills with excitement (and a bit of apprehension) when pleasuring you with nature.

Though it gets him hot to see you so appreciative of his ancient arts, your expressions of pleasure make it increasingly difficult for him to retain his slipping sense of composure...

However, he may burst out with a strange catchphrase or a silly move every now and then (matrix ordanye- bedroom edition style).

Please don't mind it- or even laugh along if you like! Caster Cu gives me the impression of being a rather surreal and random lad at times, and I feel as if the realms of NSFW would be no exception to showcasing this funnier side of him.

Seeing as Caster is more measured than his other selves, and allegedly boosts a even temperament, he may be less prone to get carried away within the moment, however he likely still has a tender side, flattering you with caring words and loving touches.

He isn't yet immune to praise either, so don't hold back in letting him know how you feel about him (he may get even MORE flustered, or caught off guard with surprise).

Despite this, it can feel as if Caster Cu is wearing a very tight mask at times. It may take a bit longer than the other Cu to really see him set loose, and let his words and feelings flow freely within the moment. It doesn't mean he's enjoying things any less, though.

After losing so many that are dear to him- over and over again- and experiencing so many terrifying moments, he may savor every moment as if it's his very last, drinking in every last second with a partner.

The here and now, this fleeting moment. Caster Cu will hold it dearly, in order to calmly let things go once the time comes.

This may manifest on him holding on a little tighter to you at times, burying his face against your own, almost as if he's worried you'll suddenly drift away.

Caster gives me the impression of being very sentimental deep down, but keeping said cards of emotion very closely bound against his chest. It may be a bit of challenge to get him to unravel a little, but it's far from impossible.

Cu Alter (In General)

In terms of NSFW, I believe that Cu Alter is an extreme contrast to the other three. Despite having the same capacity for emotion and care as the others, he operates as if he's an unfeeling killing machine- almost as if he's a beast with no reason (even though that's not always the case with him).

In my opinion, I feel like Cu Alter is most likely to have sex during a situation that fulfils a need or an urge of his- for example, having sex solely to recharge his mana, or if he needs a physical release from all the things going on inside of him.

Sex with him in these circumstances may focus on the most necessary elements of intercourse only, jumping straight to the grittiest, most business-like aspects of the act.

Cu Alter isn't the type to let himself have fun, nor allow himself to enjoy sensations as much as his other selves do.

That doesn't mean that other forms of sex are completely off the table, it's just that to me personally- it would likely be rarer for him to have more sentimental types of sex, seeing as he showcases his care for others in extremely subtle ways.

He's also suffering and struggling in an extreme manner, so it also may be extremely difficult for him to express those kinds of feelings.

Possibly as a result of the corruption of the grail and his madness enhancement, even when he showcases his deep affection- it is often marred by contradictory words and harsh insults that belies how deeply he feels for others.

Emotions are likely really, really hard for him.

Cu Alter is likely the type to show how he feels through actions, as a result of struggling severely to articulate his feelings via words.

He is very awkward and reticent when it comes to expressing his feelings, so hearing praise from him may be quite rare.

However, as his words tend to manifest as insults, he may mutter phrases of a more degrading, cold or fierce nature in the bedroom at first.

Cu Alter often says the complete opposite of how he feels. So if he were to feel affection for someone, he may push them away with some stinging words or attempts to inform them of his apparent nature.

He'll make it incredibly hard for you to get close at first, batting away words of praise; and doggedly insisting that he's nothing more than a monster- that you shouldn't praise nor adore him. Cu Alter won't harm a partner, but he may be very stubborn against praise at first.

I believe he is the type to pick up others with his tail, or wrap his tail around them, and sleep next to them; getting close. I feel like he may let his guard down a little if he feels comfortable sleeping next to his partner.

You may not hear him say how he feels, but I headcanon that he may give into guttural growls, moans and other incoherent noises when he's having a good time; claws and fanged teeth clutching onto his partner for dear life.

For Cu Alter, in a sexual setting- I think his actions will be of a much greater import than his words.

Cu Alter also purposely isolates himself from others. It's as if he is very self-punishing. So I think in terms of sex, the act itself may be a barrier to him- seeing as he does all in his power to give the impression of being distant and avoiding touch with others.

Sex could possibly be a bit rough and intense with him, or very sleepy and slow.

He does seem like the tired and worn out sort, to an almost worrying level; so I don't feel as if he'd go too hardcore- unless he eventually decides to unleash the millions of restraints that he's shackled and bound himself with.

This kind of side to him may explode within a more combat-focused situation, or a very intense one in which he decides to set off all of the things burgeoning inside of him, so it could end up being an extremely wild sort of sex. (I'm not too sure myself, as Cu Alter is a character that I find difficult to truly grasp.)

I feel like sex of the slower sort may be more likely with him though, as he doesn't give me the impression of being one who would unravel quite so easily around another.

As he seems so exhausted, there is a chance that his partner may have to take the lead at times, or initiate the mood- he's not going to really have the skills to set things up himself or flirt. I can imagine him being very languid and tired, so a partner may need to actually take Cu Alter by the hands this time.

As the once Mad King of America, Cu Alter is used to barking out orders, so you may hear quite a lot of those in the bedroom!

Cu Alter (in a more affectionate sexual situation)

I haven't got much to say in terms of this scenario, as I believe that he'll still struggle a lot to express his feelings. However, in a situation in which he gives up on pushing a partner away, he may really indulge in the little things- and wrap himself protectively around a partner, melding every part of his body against their form.

He is likely EXTREMELY touch-starved, so I can imagine him really taking in every single curve of a partner, deeply taking in every single touch, nip, bite and touch of his against yours.

I do think he has a side that is every bit as sensory as the other Cu deep down- maybe even more so, as he's been cut off from touch and isolated from others for so long.

His words will be a bit less harsh, and he may be a lot more receptive to your touch and words of adulation in this sort of situation.

I can imagine him taking extremely long naps and just holding a partner in his arms all day in this kind of situation. He wants to be as close as he possibly can to you, treasuring you with every fiber of his being.

Extra (General Notes)

I do think that Cu Chulainn would entertain many various forms of relationships and sexual relations, and that open relationships would be a possibility as well. In terms of NSFW, I believe he is open to many kinds of situations and scenarios.

#lemon fanfic #lemon fic #fate series #fgo #fgo headcanons #lancer cu chulainn #cu chulainn #caster cu chulainn #cu alter #proto cu #fate cu chulainn #fate grand order #so yeah this gave me extreme procastination. idk how accurate these headcanons are. but i hope they are a good time!#gilgawriting

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