I have a girlfriend with the premise of marriage, but I gave in to the temptation of her senior 'Nanami' and made a mistake that I couldn't take back. For fertility purposes, I abstained from sex and masturbation for a month, saving up sperm. However, facing Nanami's charm, I lost control and had beastly sex from morning till night, reaching climax multiple times. 'Isn't sex with me much better than with her?' All I could do was nod at those words...
