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ahsxual · 4 months

Text

Dark Sins

Pairing: William Afton x Fem!Reader (and a little of Stu Macher x Fem!Reader)

Summary: You and Stu have been together for a while now. You didn't like his friend Billy, because in your opinion he meant trouble. But Stu didn't care about it. In fact, it only made him want to hide you from Billy. So when the two of you were at Stu's house and Billy showed up, Stu made you hide yourself in the bathroom... little did you both know that his dad was taking a shower.

Genre: Smut

Warnings: minors don't interact +18, cheating (I don't support this, only wrote it for the fic!!), Stu not being the best boyfriend, implied age gap (reader is on her 20s, William is 50), fingering, oral sex (f&m receiving), squirting, dirty talk, mentions of daddy, chocking, cursing, degrading and humiliation kink, cnc, almost getting caught, perv!William, Dom!William x Sub!Reader

Word Count: 2,8k

Part II & Part III

A/N: In this fic, William is Stu Macher's father. I just love this idea, so I decided to write this crossover. I haven't written for so long, so I'm sorry for any mistakes or the low quality fic. I missed writing for you guys, so here I am! I'm trying my best <33

You and Stu Macher had been together for a few weeks now. He was your crush since you met him last year, and things developed over time, specially after one of his parties. You guys had sex in his bedroom at one of his parties, and let's just say it was the best fuck you guys ever had. The adrenaline running through your veins from the alcohol, the passion between you two and the risk of getting caught by one of your friends was too much. You were extremely happy when, after a couple of months, he wanted to make it official. It was like a dream coming true... I mean, who wouldn't want to be Stu Macher's girlfriend? But like in all relationships, nothing is completely perfect... and when you met his best friend Billy, you couldn't help but hate the guy. He had this creepy look whenever he looked at you both and you talked about it with Stu. Apparently the guy hated you too, so Stu decided to hide you from him. Like, literally.

It pissed you off even more. How can your boyfriend prefer his best friend over you?? The PDA between the two of you didn't exist anymore whenever Billy was around, and that hurted you. So today, you decided to go talk about this with Stu.

"Hey... can we talk?" you asked Stu when he opened his house's door for you. He already knew what you wanted to talk about, so he rolled his eyes and let you enter his house.

"Sure babe, come in." he said in fake excitement, which annoyed you to no end. How can he still think it's your fault and there's nothing wrong with what he's doing... or better, allowing others to do. It's like he cares way too much about what Billy thinks or not. What a weird relationship they have...

You both went to his room for some privacy, since his dad was at home. Talking about the man, there was something strange, maybe even creepy about him too. He barely talks to you or says anything at all, always busy with work on the few times he's at home. However, his intense eyes always seemed to analyze your body like a predator analyzes its prey. At least, that's how you felt. And it sent shivers down your spine every single time, for whatever reason unknown to you.

"So... I assume you already know what I want to talk about with you..." you were the first one to break the ice, since you and Stu have had been silent for a few minutes now. You shouldn't be feeling so nervous and you didn't want to bother Stu, but things had to be talked about when something bothers you. Communication is the key for a good relationship and that's what you decided to do.

"Yeah, I think I do." Stu seemed way too relaxed for your liking, his arms supporting his body onto his bed like he didn't care how this conversation would end.

"Can you just pretend that you care about how I'm feeling instead of like, running away? Because that's what it looks like you're doing and it annoys me, Stu. Deeply." you shouted at Stu, your patience disappearing by each second. But when he looked at you with those hungry eyes, you immediately knew what he wanted to do. Again. Every single time.

"Come on babe, we can do so many interesting things instead of arguing, don't you think? You look so fucking hot when you're mad at me." a large smirk was planted on his face, before he pushed you down onto his bed, his tall and lean body over yours while he grabbed both of your wrists with one hand and pinned them on the bed. He started sucking and kissing your neck, while his free hand grabbed your tits hard, making you moan.

"Stop it Stu, we have to talk about..." you tried to sound serious, but the truth was that you forgot what you wanted to talk about in the first place. You couldn't resist Stu: he had that power over you, and even tho you hated it sometimes, it was simultaneously the thing you loved about him the most. The way he made you weak to your knees by a simple touch. You felt like you were in heaven for a few minutes, before Stu's phone started ringing. You both looked at it annoyed, and when you thought you couldn't be more bothered, you saw Billy's name on it. Stu immediately got up, before sending you an apologetic look.

"Hey man, what's up?" Stu's face went from excitement to fear in a second, and you looked at him asking mentally what happened. "Yeah sure, just give me a sec." and then Stu hung up the call.

"What happened? What did he want?" your tone was a little bit harsh towards Stu, but you couldn't control it. What did Billy possibly want this time??

"I'm sorry baby, but... Billy is actually on my doorstep. He's outside and needs to talk to me... like right now." you could tell your boyfriend was feeling bad for interrupting your intimate moment, but he still didn't say no to Billy.

"You're kidding me, right? Does he know that I'm with you? Can't you tell him that??"

"Come on y/n, just cooperate with me! It will be fast I promise, just..." he paused for a second, before grabbing your arm and taking you to the bathroom. "Just stay here for a minute, okay? Don't come out until I tell you so! Love ya!" he then kissed you and put you inside of his bathroom way too quickly to realized that it might be occupied...

"Wtf!" you shouted quietly, visibly pissed off by the ridiculous situation you were put in. How could Stu do this to me?? Hiding his own girlfriend, because his friend didn't like me? You thought. When you were walking backwards, you didn't even realized that the bathroom was in fact, occupied. By your boyfriend's father.

"Shit!!" you screamed when you collided with a strong, bare and wet chest. When you turned around, you couldn't believe your eyes. It was your boyfriend's father, William Afton, completely naked with just a towel around his hips. You stared a little too long to his tall, nice built body for his age, before you closed your curious eyes. "Omg, I'm so so sorry Mr. Afton, I didn't- this is all that asshole's fault!" you whispered to yourself the last part, referring to Billy. Well, in reality it was Stu's fault, but you didn't want to think about it that way.

"May I know why you haven't left yet? Seems like you're enjoying being here... in my presence." William's tone was serious and his eyes roamed all over your body, since you were wearing a short dress. If you weren't feeling so embarrassed, you could tell that he was in fact teasing you.

"I-I can't Mr. Afton... Stu doesn't want me to get out of here... I don't know what to do... well, on second thought, I should probably go." you never felt so embarrassed in our entire life. You didn't know if you should leave and go against your boyfriend's stupid request, or if you should just stay there being confronted by Mr. Afton lustful eyes and semi-naked body. This was his opportunity, he thought. Just the two of you... alone.

He wanted to show you how much his son didn't deserve you. He wanted to show you who could be a real man to you. Someone who didn't refuse to pleasure you like his son did to you just now, even tho you could be caught. What you didn't know, was how long William have been desiring you. Waiting for the perfect opportunity to be with you and make you forget about his son only with his dick. To prove to you that you didn't know real pleasure until he fucked you until you're begging for his mercy.

"Who said you're getting out of here, huh?" how dumb and innocent you are, he thought. Thinking that now that everything was according to his plan, you could escape him. It made him laugh, actually.

"I-I don't understand, sir..." your back was against the bathroom door, not allowing you to escape his slow approach towards your small body compared to his. The moment you called him sir made his cock harder, and when you noticed it through the thin towel, you gasped loudly not just by the unknown effect you had on him, but at the size of it. It was huge and you could tell that it was thicker than Stu's dick.

He noticed you staring at his cock and smirked at your reaction. He knew deep down you wanted him too. You naughty, dumb slutty girl. He suddenly approached you faster, not even caring about the fact that his towel fell on the ground, leaving him completely naked in front of you and showing you his dick fully erected because of you. Before you tried to say something, he covered your mouth with his big hand.

"Shhh. Don't say a single fucking word, you understand me? You don't want my son to find out that you're about to get fucked by his father, now would you?" his voice was deep and low, and you could hear the lust in it. You felt scared. Terrified actually, for what was about to happen. But then, you felt something that betrayed your mind. Your panties were dripping and your clit was throbbing, wanting desperately to be touched. All of a sudden, you heard the door being locked by William.

"Please Mr. Afton, I-I don't want to cheat on Stu, please..." you were so desperate not to sin, since you're completely against cheating. But it seemed like you had no choice... and the worst of it, was that you couldn't deny how much attracted you felt to the older man. By this point, you didn't know if you were talking to William or to yourself. Suddenly, you felt William's cock against you, hard and desperate for your attention.

"Too late for that, bunny. I'm gonna teach you how a real man can pleasure a sweet thing like you... don't lie to yourself. You want this as much as I do." he suddenly grabbed your hand and put it on his hard cock, pre-cum leaking from the tip. You started to jerk him off, not being able to stop since he was controlling your movements. "That's it, you dirty slut. Now be a good girl and suck daddy's cock." William forcedly grabbed your hair and pushed you to your knees, making you gasp in pain. He then opened your mouth and shoved his dick in, making you gag around him.

You started to suck him off since you had no option but to obey, before he pushed you back by your hair and took your dress and bra off, leaving you only in your panties.

"Don't worry, I'll rip them out soon." the older man promised before he pushed you against his cock again. After a few minutes, he felt himself almost reaching his limit, so he pushed you back once again, this time for good. He then grabbed you and put you onto the long bathroom vanity, before tearing your white panties in one move.

"Mr. Afton! Those were my favorite panties!" you were shocked by his rough action, realizing that when he said something, he would do it. William laughed at your face, realizing that you and Stu apparently never had real fun.

"If you behave and cum for me, maybe I'll give you new ones for Christmas." he promised before circling your extremely sensitive clit. You moaned loudly, so he quickly covered your mouth once again. "What a dirty fucking whore you are. Can't keep your mouth shut while being fingered by a man old enough to be your father... leaving aside the fact that it's actually your boyfriend's father too." he degraded you, before shoving 2 long and thick fingers inside you, not giving you any time to adjust to him. His movements were cruel and faster than any man you had ever been with before, making you cum in a few minutes.

"Fuck Mr. Afton, I'm gonna cum!! Please s-stop!" you didn't know why you were pleading him to stop if you didn't want to. Maybe you thought that if you didn't cum, maybe it wasn't real cheating... How stupid you were to think that. Obviously there was no going back now.

"You're fucking dripping, bunny. Look at my fingers, fucking you so easily and being all drenched in your cum. You should be ashamed of yourself, you fucking slut. I bet my son never made you cum so fast and hard." and those degrading words, which were the truth even tho you didn't want to admit it, were enough to make you orgasm. Hard. The way Mr. Afton humiliated and deprived you to breath properly with his hand covering your mouth and nose, was all you needed to squirt onto his big hand. Your moan was muffled by William's hand, otherwised Stu and Billy would hear you without any doubt.

"Oh fuck..." you said once you looked at the mess you made. William's fingers and cock were drenched in your cum, and he hadn't even fucked you with his cock yet. "I'm so sorry Mr. Afton-" your apology was completely ignored and immediately replaced by a loud gasp from you when William opened your legs and licked your cunt like he was a starved man. His tongue expertly sucked your wet clit before he fucked your hole with his long tongue. He continued to suck on your clit and fuck your hole just the way you loved, when suddenly you heard Stu's voice. You wanted to scream from fear of being caught in such a vulnerable, embarassing position and act, but William knew you too well already, so he put his hand over your mouth before you could make any sound and continued his attack on your dripping pussy.

"Wait man!" you heard Stu saying to Billy. Apparently, Billy wanted to go to the bathroom, but Stu stopped him just in time. "You should go to the bathroom downstairs. I took a shit on that one before you arrived." if you weren't in this situation, where your boyfriend's dad was eating you out like a madman, you would have laughed at the poor excuse that your boyfriend came up with. However, you were too focused on cumming again, this time on William's mouth since he didn't stop fucking your cunt with his tongue the whole time. Oh, that mouth... you definitely wouldn't forget it. It even looked like somehow, William did want to get caught to prove his son that he could make you cum harder and faster. That even if he was older, he was better nonetheless.

You started to feel your second orgasm approaching. "Fuck Mr. Afton, I'm gonna fucking cum again." you didn't know why would you tell him that or why you were saying it out loud, if you felt ashamed about all of this.

"Come on, babygirl. Cum for daddy one more time, squirt all over my face." and that was it. Somehow you managed to squirt once again, this time on William's face. Even tho it wasn't as much as before, you still covered his face and mouth with your cum. "Good girl. I know you could do it. You're being so nice for me, just one more time." when he said that last part, you looked at him with wide eyes.

"I-I can't anymore sir, please..." you were breathless and covered in sweat from his actions. He suddenly grabbed your neck and chocked you enough to make it difficult to breath.

"Yes you can, and you'll do it for me." for the first time, you were scared of him. Scared about what he could possibly do to you and the fact that you could be caught anytime now. He lined his big cock against your overstimulated pussy, ready to fuck and destroy you, before you both heard Stu's voice again.

"Alright man, see ya later! Don't forget to bring my things tomorrow!" Stu said before closing the front door downstairs, saying goodbye to Billy. You looked desperately at William, and even if he wanted to destroy you right there and then and couldn't care less if Stu caught you both fucking, he didn't want you to be in big trouble. You and William started to hear Stu's footsteps, so William took your damaged panties with him, grabbed his towel from the ground to cover himself up and got ready to go to his bedroom before Stu came in and saw you two together.

"Get yourself presentable. You don't wanna look like you just had been fucked, right? Next time bunny, I'll make sure there's no one to interrupt us. Prepare that tight and sweet pussy of yours." he said in a serious and cold tone, like he didn't just say the most sinful thing to you. Before he left, he smelled deeply your ripped and drenched panties and stuffed them inside his mouth.

And there you were. Left alone naked, covered in sweat and cum and thinking about how William's cock would feel deep inside of you, ripping you apart.

And that's when reality hit you and slapped you hard in the face. You just cheated on your boyfriend with his own fucking father.

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