[DVAJ-641] [29th day of abstinence...] I promised to have the best sex after refraining from masturbation for a month, but I succumbed to my girlfriend's younger sister's temptation to reverse NTR and even after I used up a whole box of condoms, I (Censored)

My girlfriend read an article that said, ``Sex feels great after a month of abstinence!'' and was forced to refrain from masturbation, but from that day on, her younger sister Mito began seducing me. It seems like she's interested in me, and normally she's just flirting with me, but she's so horny from her abstinence that I can't take my eyes off her panty shots. No, no, I don't have a girlfriend... But when I'm about to end my abstinence in one day, I say, ``If you put on a condom, it's not cheating♪'' I lose my rationality at the very convenient invitation, and I fuck her J-type body until I use up the whole box! However, his pent-up sexual desire cannot be stopped and he enters the forbidden raw sex!