"Sex after a month of abstinence feels amazing!" My girlfriend picked up a rumor from somewhere, and I was forced to abstain from masturbation. It was painful enough to die just to have to abstain from my daily masturbation routine, but the biggest problem was the existence of her younger sister, Mito-chan. She had been acting interested in me for a while, and I had brushed her off as an older woman, but... Mito-chan's temptations escalated during my abstinence! She purposely showed me her cleavage, flashed her skirt, and showed me her panties, and my erection was rock hard all the time. One day, when my reason was reaching its limit, Mito-chan whispered to me. "As long as you wear a condom... it's not cheating even if we do it, right? lol" *This work is a sequel to "29th day of abstinence..." I promised to have the best sex after abstaining from masturbation for a month, but I gave in to my girlfriend's sister's reverse NTR temptation and used up a whole box of condoms, and I couldn't stop having raw sex and cumming inside her many times. This is an excerpt from "Mito Wakui" (product number: dvaj00641).