Big brother who knows his poor teenage sister is so horny these days--he's seen her hard cock straining against her pajamas when the movies they watch together have even the barest hint of sex, heard the way she spends hours at night and on weekends meaning softly to herself in her room, felt the way she pulls her hips away a little bit when she hugs him so that she won't accidentally get hard pressed against her own big brother... It seems so hard for her. He wants to help. And so, when he leaves his door open at night, he doesn't mind the way she sneaks into his room and climbs into his bed. The way she hugs him from behind and burrows her face in his shoulder. The way she nestles her hard cock between his legs, rubbing against his crotch and fucking his clothed thighs. She thinks he's asleep, and he'll pretend to be for her sake. He loves her so much, his dear little sister. He'll do anything to make life easier on her. He'll let her do what she needs to do.
And so, when she gets a little bolder, and tugs his boxers down, too, her cock now pressing directly against his cunt lips...
Well, he won't hold that against her, either. And maybe he'll move his hips so that it's a little easier for her to slip her hard cock into his tight, wet cunt. She clearly needs it, after all. Her hips are moving so desperately. She must have been pent up. It's okay--he'll take care of her. A good big brother always lets his sweet little sister cum inside.
