DVAJ-641 【Day 29 of abstinence…】After a month of no masturbation, I promised to have the best sex ever, but I gave in to her sister's reverse NTR temptation. We used up an entire box of condoms and still didn't stop, having unprotected sex multiple times

"Sex after a month of abstinence is the best!" After seeing an article like that, my girlfriend imposed a no-masturbation rule on me. But since then, her younger sister, Mito-chan, has started seducing me. She seems to have feelings for me, and although I usually brush her off, the pent-up frustration makes it impossible for me to look away from her panty shots and cleavage. No, no, I have a girlfriend... However, just as my abstinence period is about to end, she says, "Wearing a condom doesn't count as cheating♪" Her convenient invitation shatters my resolve, and I fuck her J-cup body until the whole box of condoms is used up! But the pent-up lust won't stop, leading me into forbidden barebacking―!