In this adult sibling role-play, Sora and I have always been such close siblings that everyone notices. But after Sora grew up and I found a girlfriend at college, we started spending less time together. Then one day, my girlfriend dumped me harshly—and Sora saw the whole thing. Perhaps she felt sorry for me, because she kissed me and asked, “Want me to be your girlfriend?” From that day on, Sora began aggressively tempting me almost every day...