I'm thinking about free use. I think most of us are on the "being completely indifferent to it is kinda boring" train, and I've seen plenty of posts talking about free use where the free use object just falls apart immediately and is a drooling mess throughout the whole interaction. but I think we can make it way more rape-y and way more incest-y and by extension way hotter. >:)
imagine a free use daughter (or son if you prefer, but anyhow) who really doesn't want to be free use. she doesn't have a choice, though, some external circumstance is preventing her from saying no. perhaps she's trying to protect a sibling, or daddy is threatening her with some worse punishment or blackmail, and really daddy's just making them both feel good so honestly it's not that bad and she should just let daddy take what he wants and it'll be over before she knows it.
either way, baby girl is trying to do some homework. she's sitting at her desk when daddy knocks on the door, walks in, and locks it behind him. as soon as he locks the door she can already feel her pussy clench and begin to drip into her panties. daddy walks up behind her at her desk, puts his hands on her shoulders, and leans down to see what she's doing.
"homework. due in class tomorrow."
"you've been at it for an awful long time now, sweetheart." his hands wander down his baby's back, around to her front and under her shirt, pinching her nipples, squeezing her flesh in his palm. her breath hitches but she tries to keep focused.
"I just wanna get it done and sleep."
"it's important to take breaks every now and again, love." one of his hands travels down, his thumb hitching in the waistband of her sweatpants.
"I'm fine. don't- mmph. I don't need a- a break. almost done anyway." daddy's fingers travel along her slit, brushing so so lightly against her clit. she's already so slick for him, but what's the harm in warming her up anyway?
"hmm. if you say so. you can keep working, but I'm gonna need you to stand up for me and lean against your desk for me, sweetheart." his fingers slide inside her cunt and curl upwards. she yelps, but still maintains most of her composure.
"ah- dad, do I- mmmphh, can't this w-wait?" she squirms in her seat, trying unsuccessfully to readjust and make the intrusion less noticeable.
she hears daddy unbuckling his belt and his pants drop to the floor, feels his cock prodding her back.
"babydoll, do I really need to remind you-"
"no, f-fine. fine. I get it. sorry."
"good girl. come on, now."
she stands up and moves her chair out of the way, bends over her desk, and tries to get back to work. daddy pulls her sweatpants, her panties, everything down just enough to expose her glistening little pussy and the wet spot in her panties, lines up with her entrance, and slams himself inside.
"ah! be- unh, be gentler- fuck, dad, please."
daddy thrusts himself inside even deeper, pressing against her cervix hard. "no, ma'am, this pussy is daddy's to use however he wants." he pulls out and slams back in again, setting a brutal pace.
"unh, d-daddy, please..."
she's trying so, so hard to keep working on her homework. her handwriting is getting sloppier, she's slower answering each question.
"no, baby, just- mmph fuck, baby. just be good and fucking take daddy's love. it'll be easier if you just let daddy have what he wants."
daddy reaches around and pinches her clit, eliciting a squeal. and that's it, she can't keep it up anymore, she can only brace herself against her desk and let her tears stream down her face as daddy uses his pretty little toy.
"d-daddy, pl-please, not my clit, please!"
she can feel herself getting close, she doesn't want to cum on daddy's cock again, but he just rubs it faster and pinches it harder.
"come on, baby. give daddy what he wants, you can do it, sweetheart." he whispers in her ear as he feels the telltale squeezes of her cunt, right on the edge of orgasm. she cries harder, shaking her head and trying to hold in a scream as she finally cums while she's wrapped around him, squeezing and milking his own orgasm from him as he presses up against her cervix, painting her white as he gives her a few last short, rough thrusts to fuck his seed deeper into her.
daddy stays inside her for a few minutes before he slides his cock from her still spasming cunt. his semen immediately begins to spill out of her, dripping into her panties. he tucks himself back into his pants, leaving her slumped over her desk, face red and splotchy and wet with tears.
"thanks, sweetheart. now go ahead and finish up that homework before bed." daddy slaps her ass and leaves her alone, still dripping his seed into her panties.