Your step-sister knows your humiliating secret, that you're a adult guy who still has incontinence issues & step-mother puts you in diapers so you don't have accidents all over the furniture.  Step-mom is about to give you a matter of fact diaper change in your room but your step-sister & her hot friend Vika is peeking around the corner watching the entire ordeal go down! Vika is in disbelief that a grown up needs incontinence protection & whoa... those are some big diapers. They see you exposed when your diaper is opened up & they see you naked an lying there getting wiped.  They talk about you & step-mother isn't doing anything to make them stop.  Steps-sis Diaperperv is being so mean about it!  When you're done getting your diaper taped on the girls barge into your room & Diaperperv shows Vika your drawer of nappies & Vika is shocked. They laugh, tease you & call you a diapered loser... Vika is curious and diaper checks you with her hands & you accidentally CUM from her touching your diaper!! OMG, Step-sis Diaperperv is relentless & totally makes fun of you... it must be the first time a girl has made you cum, LOL