A female friend, Yui Tano, with whom I enjoy playing games and having meals together when we get along, and who's even open to having sex. (SNOS-314)

Yu and I are close friends who can share trivial topics and speak our true feelings. We have a relaxed relationship where we can talk about anything without any formalities. Until one day, because of a sentence Yu said, we crossed that line. "Hey, want to see my breasts? It feels good to maintain a sexual relationship even though we're friends, right?" We're not lovers, nor friends with benefits, just a physical relationship maintained as friends. "Eh...wow...your dick is so big. It feels so good...laughs." We get along as easily as usual, but I'm having sex with my close friend... Although it feels incredible, it's a pleasure I've never felt before. Yu's sexy, big-breasted riding position... Her upward gaze during oral sex. "We'll still be friends." This is the relationship between me and my big-breasted close friend that changed because of sex.