You're chatting with your sister when she asks you if you've ever watched anal porn. She shyly reveals that she's been watching a lot of anal porn recently, which surprises you because you'd never imagined her watching porn at all before. She confesses that she's curious to experience anal and asks you if you'd ever consider it, before playfully teasing that noone else is at home. She suggests that maybe you should fuck her asshole, it wouldn't be weird because it isn't like real sex and it's not like you could get her pregnant. She begins to beg and argues with you that it would be so much better for her to have her ass fucked by you, her loving brother, than some random asshole guy. She pulls her panties to the side and begins teasing her asshole with her fingers, begging for your cock. You try to resist but watching her makes your cock hard and she notices how much this is all turning you on. You surrender and give her what she's begging for, a deep, hard fucking in the ass. You had no idea that blowing a load in your sister's asshole could feel so good...