sis comes into the living room and asks if she can hang out with you for a bit. she thanks you for letting her stay in your room until she moves into her new place, even though it feels weird to be back at mom and dads house. she mentions that if there is anything she can do to repay you, she'll do it. you ask to see her pregnant belly, her ass, then her tits (but dont call your sisters boobs, tits because its weird). she tries to give you a closer look at her veiny tits but then you slip your cock inside of her, you couldnt help it. she is immediately turned on but asks if you have a condom on.. but wait, it doesnt matter since she is pregnant, so you continue fucking. she has secretly been wanting to fuck her own brother for awhile now but hasnt made the move. your sister begs for your cum inside of her but we have to be quite, we dont want to wake mom and dad