SONE-640: I Dated the Younger of My Childhood-Friend Sisters — The Older Sister Who'd Actually Always Loved Me Goes Jealous and Tempts Me with No-Bra Breasts — 夢乃あいか

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If I'd been honest sooner, no one would have gotten hurt... Me, Aika (older sister) and Risa (younger sister) were childhood friends and were always together during school. I liked Aika, and I was certain she liked me too. But we were too close and never progressed, and we ended up in our thirties. I often visited the share house where the sisters lived. One time when Aika and I were talking, reminiscing about school, she said, “You're clinging to past glories, that's why you don't have a girlfriend at your age.” Why did she have to say that... I got angry and shot back, “You're single too! You're single because of your personality.” Risa, sensing the fight, comforted me, then confessed and we started dating... partly to spite Aika. The moment Aika heard we were together, she began tempting me with no‑bra breasts. I'd always thought her breasts were big, but were they this big... I could even see her nipples... “Risa has no experience with men, I don't want her to get hurt. Want to practice sex with me?” Jealous Aika desperately tried to win me back. With Risa nearby, I — the worst — gave in to Aika's seduction and had relations with her many times. “Do you really like Risa?” “...I've always liked Aika.” Why couldn't I have said that earlier... I told Risa my honest feelings. “I thought so... You should have been honest from the start.” She left angry, but she understood. At last, we became lovers...