One day while Chris, my big step-brother, and I are home alone, I get a call from our step-mom, who is out running errands. She needs me to put my step-brother on the phone, but when I go to Chris's room, I catch him masturbating! AND he's got my dirty workout panties in his hand, sniffing them while he jerks off. Worse, I catch our step-mom's dirty underwear on the bed next to him. Grossed out, I punish him my shoving my ass in his face while still on the phone with our step-mother, shaming him. But his dick only grows harder! I punish him more by sticking his cock in my pussy, but stop before he can cum inside of his little step-sister. This is a punishment after all. I stick my butthole back to his nose and instruct him how to jerk off and cum all over my stinky, dirty ass. I warn him that if he doesn't do what I want from now on, I'm going to send a recording of all of this to his girlfriend and she'll know how big of a perv he really is! --- Keywords: big bro, big step-brother, Chris, little sis, little step-sister, step-sister, siblings, taboo, step-mom, step-mother, mum, dirty panties, panty sniffing, panty smelling, underwear, workout, sweat, sweaty, gross, humiliation, degradation, shame, shaming, caught masturbating, jerking off, jacking off, JOI, dildo fucking, butt, butthole, ass, asshole, smell fetish, smelly, rank, thong, blackmail, gf, girlfriend, breaking out, pimples, on butt, on ass, acne, femdom, domination, tattoos, step-moms panties, step-mom's panties, sis panties, step-sister's panties, step-sisters panties, sis's panties