After witnessing the astonishing masturbation of a masturbation fanatic girl, I was appointed as her exclusive penis masturbation supporter. Uruki Sara MUDR-400

I never imagined my sister would be a shut-in who skips school and stays home all the time, and a pervert who masturbates incessantly like a madwoman! I'd been thinking about strange noises coming from her room… and after I caught her masturbating, she just nonchalantly started using my penis to masturbate without a condom!? While hands or toys are nice, the real thing is definitely the best! Right now, she's thoroughly enjoying her "brother's penis masturbation cup" that she can use anytime!