I see a lot of cnc somno posts about going down on someone or using their cock/pussy while they're asleep but I think we should talk more about using their mouth right away.
For men it's easy, you push the mouth open and slide your dick in there, but for women, we'd have to rub on the person's face. Let them feel the warmth and wetness and wake up confused, seeing us on top of them. They'd look at us still half asleep, try to talk, be shushed by our pussy putting more pressure on their mouth, and realize what we want.
They'd start to lick and suck and once we cum we could just give them a little forehead kiss and put them back to sleep. Wouldn't it be fun to then mess with their head the next day and pretend it never happened and they dreamt about the whole thing? After all, they wouldn't have any proof it did, and licking a pussy while half asleep doesn't require a lot of focus, so they wouldn't have woken up enough to have clear memories. Especially if we ordered them to keep their eyes closed.
Gaslighting them like : "Come on, if I wanted to have my way with you, don't you think I would've done something easier than sit on top of you and wake you up? Don't you think I would've, on the contrary, made sure you stayed a sleep? You just had a naughty dream because you couldn't keep me out of your dirty mind. You're so cute💕"
I don't know, there's just something really tempting about that.