Krystal busted her little brother masturbating but instead of making him feel bad she offers to lend him a helping hand.. or mouth. To his surprise she offers him a hand job or blow job and before he can say anything his penis is already in her mouth. He doesn't really know what to do while sis brings his dick to levels he had never experienced before. She's in for a surprise herself because she didn't realize just how BIG her little brother had gotten down there. She remember his little penis when she used to change his diapers, but 18 years later, well lets just say, he grew a lot lol. As she sucks him up and down, up and down, up and down she realizes that she's enjoying this way too much. I mean she just meant to give him a little kiss down there but now she cannot stop but getting aroused by her siblings engorged penis in her mouth. She decides if she's gone this far then she might as well finish the job. So with every stroke and lick she gets ready to become his cum bucket... He doesn't know that to expect and then all of a sudden he feels an orgasm coming on, but she won't stop! But rather she keeps massaging his member with her tongue and cheek muscles. It feels so nice and warm as she gently sucks them juices right straight from his cock into her mouth... But sis! Where did all my cum go? Knowing what's on his mind, she shows him all his cum drooling out of her mouth. Wow, girls are weird and wonderful he thinks to himself. Just then Sis swallows!! No evidence left for mom and dad to find lol. He's so relaxed. Maybe he'll leave the door open next time and hope Sis see's him masturbating again lol. Thanks sis