Although I became the boyfriend of my senior coworker, Saeko-san, she seems to dislike virgins and won't let me do anything sexual with her. So, I tried a matching app, and who showed up but Saeko-san's sister, Mariko-san! Her husband is on an overseas assignment, and she seems frustrated. Under the condition that we keep it a secret, our friends-with-benefits relationship began... Unlike my girlfriend, Mariko-san even lets me finish inside her. The sex with her feels so good it melts both body and mind! And then desire escalates more and more, even at home secretly...
