Janira storms into her brother's room, angry, and wearing only a bra and panties, to scold her brother for once again fucking with the dryer so now she can't get dressed...but before she can finish her sentence, she looks down to see her brother sitting on the floor in a fucking diaper!? After a few seconds of shock, Janira begins to digest the fact that her brother, only a couple year younger than her, is seriously wearing a diaper and starts to question him while humiliating him. Janira discovers that her brother's weird diaper fetish is actually about the way it feels- securely fitted around him- hugging his cock nice and tight, more than acting like a baby...but she doesn't really care, it's hard not to talk to someone like a little baby when they're wearing a fucking diaper. Then Janira realizes that the humiliation seems to turn him on! Damn, this is just too good! Clearly the bratty blonde isn't going to waste this opportunity. She keeps taunting her brother, and as she does so, he gets harder and harder in his diaper. Janira instructs her little brother to start rubbing his cock over the diaper, laughing as he follows her orders. Then, she can't resist, she has to get in on this. The pretty blonde gets down right in front of her brother and takes his place rubbing over the crinkly diaper. What a fun new game these siblings have found! Janira alternates between making her brother rub his own crinkly diaper while he watches his sister for motivation, and taking over herself, right up until he cums so much that his diaper can't even handle the mess! And then she leaves him there to deal with his nasty cummy diaper himself.