My girlfriend, who I live with, went back to her parents' house for three days. My girlfriend's friend Elisa-chan came to check on me so I wouldn't cheat on her... Even though I knew it was wrong to cheat on her, I was glued to Elisa-chan's voluptuous G-cup breasts... "If I can hold back for two days today and tomorrow... , You can have sex with me on the last day♡'' I can only say ``yes'' to this unexpected proposal, and as I do, I end up in a tit-fuck hell... Aiming for sex on the last day, I hold back my ejaculation. On the last day, there was an explosion. Sperm that won't wither no matter how much you let it out, an erection that won't subside. It doesn't matter if I'm cheating or not...I'm obsessed with the G cup breasts in front of me. To her...I'm sorry...