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Some general headcanons about Billy and how he operates in sexual scenarios.
- So I feel like it's a pretty common headcanon for people to think he has a removable dick and/or can change his parts at will whenever he feels like it. Feels like a pretty common headcanon for robot and robot-adjacent characters after all. Different sizes of cock, different textures and lengths, hell he probably even changes the cum he uses if he decides to go for it. Hell, he can give himself a pussy instead if he feels like it. There's a lot of variety that Billy can have and that's a strength, but ultimately I feel like he'd generally only do that if his partner was interested in experimenting. He's usually just gonna stick with the model he personally ordered for himself when he got those modifications, and if you don't ask him to change it, he won't. Ol' Reliable is his go-to forever. His normal cock fits the look of the rest of his body, being a generous length and a decent width. It's silicone, as is the rest of the crotch area of his body and has slight tapers on the top. Nothing super extreme, just enough to bump up against your walls deliciously when he fucks you. Billy prefers topping as well, but he does have a few different choices of pussy or even ass if you want to take that role. He's cool with it.
- Though Billy likes to penetrate his partner most of the time, I think when it comes to whether or not he's submissive or dominant, it depends on what his partner wants. He's versatile, though tends to be more sub-leaning if not just...a little bit less "cool" in bed. Suave sexiness doesn't come easy to him with his partner in general (though he has his moments, he's usually a blushing goober who wants affection, despite what his usual attitude and appearance leads people to believe) and so in bed? When he's already losing his mind from how wet and slick and warm you feel around him? He's not gonna be able to get any flirtatious lines out apart from a few small phrases that come out on their own. Which is fine, his natural coolness can be just as hot as when he's actively trying. Just don't expect anything super """daddy dom""" from him, since that's just not the type of guy he is. Even when he's dominant, he's a gentler dom who still whimpers and moans for you when he pushes your head down his length.
- Billy's not gonna magically stop looking at porn even if you start dating (unless you make it EXPLICITLY CLEAR that you DON'T want him to. Say it outright!) but that doesn't mean that he's looking at it because he's imagining the people in the videos or images doing what they're doing to him. On the contrary, once you guys start dating, he tends to project the two of you into the videos he watches. Hand around his cock as he desperately thrusts into it, panting heavily while he watches two lovers intimately intertwined...he imagines what they're doing to be the two of you. It's easier for him to fall into the habit of doing that to relieve his tension when you're away for a long time and he can't get into contact with you in person. He'd never suggest you two watch it together, though. He's a bit embarrassed to reveal the sorts of things he's imagined you doing to him, or vice versa. He's also embarrassed that, predictably, a good chunk of his porn history involves male cyborgs/robots and their human partners, but you can probably see that coming.
- Billy is an incredibly expressive guy on his day-to-day life, of course he's gonna be incredibly expressive even in bed. Moaning your name desperately as his hands roam your flesh and nuzzling his screen against your neck, staring down at you with eyes crinkled in a pleasured squint, his internal fans whirring loudly and trying to keep him from overheating...he's extremely receptive to even the littlest bit of teasing. You can get him whimpering from just grinding on him a little while you kiss his face. It makes it extremely hard to get some proper time together when it's later at night, which is unfortunately the only time of day he can really get personal time with you on busy work days. He'll do his best to be quiet if needed, but he's not gonna be able to hold back all his whimpers. It's hard to do it especially since the audio from his speakers isn't muffled by him covering his mouth, and he usually just has to try his best not to let out a louder moan than a whine. Lest Nicole break into the room in the middle of the night and berate him while he has his cock out.
- He's a pretty vanilla guy, all things considered. He just likes good ol' penetrative sex, be it in your hole(s), mouth, hands, or even just rubbing it between your thighs. That's usually enough to satisfy him. It's not that he's not interested in exploring other sexual possibilities, it's just not something he needs necessarily. There are things that Billy is interested in, such as wireplay. It's partially a placebo effect, any way you touch him during sex is guaranteed to make him arch his back into your touch. His wires aren't particularly sensitive unless he's hurt, but something about it just makes his brain feel electrified (not literally...mostly.) He's also not opposed to you cosplaying your favorite Starlight Knight and putting a sexy twist on the costume somehow.
Though there's some kinks he would be willing to give a chance, when it comes to kinks, there's a lot of kinks that Billy wouldn't be interested in trying. He's also not really into the idea of threesomes. He doesn't want to share you nor does he like the idea of making you feel jealous by sharing him. He also doesn't like anything that'd involve you getting hurt by him--he can take a beating, a few bullets, etc., he's trained for that. But he's heavy, metal and strong despite how agile he is, and he wouldn't wanna take the risk of, at best, breaking your bones, and at worst, killing you. Anything risky that could endanger his boss's business is also usually a no-go, so things like public sex are usually something he won't want to do. Unless, maybe, you were in a private enclosed space that just happened to be public, like a single-room bathroom in a club. - He's a very affectionate lover, so aftercare is always a priority for him even when you two don't do anything particularly saucy. He can go from running a bath for you and helping you scrub yourself clean, to just getting you a bottle of water and some wipes to clean yourself with. Billy himself is never really in need of much other than cleaning, and his stamina is inhuman even if it is possible for him to get exhausted or breathless, so he's usually able to hop up right away and go get you what you need. His favorite activity to do after you're done is to cuddle up with you underneath the blankets. Or, in the case his body is still warm and needs to cool off, sitting next to you in bed while you either cuddle up to him or stay away so his body won't risk burning you, no matter how little of a burn it might be. He'll stay awake as long as you need him to, brushing his hand against your face as his eyes turn upwards in a smile and curling up around you like a protective barrier.