My girlfriend found out I was cheating on her and ordered me to abstain from masturbation. I ended up staying at her house for a while under her watch, but... while she was out I masturbated! While I was masturbating, her sister Akane came in and said, "You're so horny, if you see something like that..." and started playing with my nipples and dick! She took my dick in her mouth... and then inserted it raw in cowgirl position! Wow, it's amazing! She's pounding my ass and I feel like I'm going to come...! But she pulled it out and gave me a sloppy blowjob! We had endless PtoM, and Akane kept giving me blowjobs and raw sex over and over again, and for the five days I was supposed to abstain from masturbation, she controlled my ejaculation the whole time...