After a double hot spring date with her friend's boyfriend, she develops feelings for him... Secretly having sex is the real secret. Chizuru Ema STARS-792

I went on a hot spring trip with my best friend, and ended up having sex with her boyfriend. He's not my type, but we're physically compatible, and it was amazing. Honestly, I've always envied that couple. Even knowing it was wrong, I couldn't stop; doing it secretly without my friend and boyfriend knowing was incredibly exciting. Shh, it's a secret.