Mocking the older sister who is heartbroken over her girlfriend

Momona's fiancé is a failure, he drinks, gambles, smokes, and leaves his fiancée to escape debt. Since then, Momona never leaves the house, her face always showing sadness. Today, Momona's younger sister Sayuri brings her boyfriend Tsubasa to play at home for the first time. Tsubasa was immediately attracted to Momona's huge breasts when they first met. Perhaps because she hadn't been in contact with men for a long time, Momona knew Tsubasa was looking at her breasts but deliberately didn't cover up, letting him look.

Seeing Tsubasa's erection in his pants made Momona's long-buried arousal awaken. And when they met in the bathroom, Momona couldn't resist anymore and actively gave Tsubasa a blowjob. And just like that, their secret relationship began. They continue to have sex whenever they can, even though Sayuri is right next to them...