Even though I have a girlfriend and I intend to marry her, I gave in to the temptations of her senior, Nanami, and made a mistake that I can't take back. I had been abstaining from sex and masturbation for a month in an attempt to get pregnant, and had been saving up my sperm, but Nanami's charms made me lose control and we had sex like beasts, from morning until night, climaxing over and over again. "Sex with me feels so much better than with that girl, right?" I could only nod in agreement to her words...