The story revolves around Shinya, a young man who finds himself living under the same roof as his two beautiful sisters-in-law, the mature and seductive Kaoru and the shy yet curious Shizuka. What begins as simmering incestuous tension quickly erupts into a whirlwind of forbidden lust. Kaoru is the first to make a move, unable to resist her carnal desires for her brother-in-law. She seduces Shinya in a series of intensely passionate encounters, teaching him the art of pleasure while shamelessly using his body to satisfy her own pent-up frustrations. Their nights are filled with the slick sounds of fucking, as she rides his hard cock, demanding he fill her pussy with his seed. Soon after, the seemingly innocent Shizuka, feeling a mix of jealousy and burgeoning lust, also gives in to her desires. She offers her tight, unused body to Shinya, leading to rough, desperate sex where he claims her virginity. The series culminates in explosive threesomes, where both sisters-in-law abandon all shame and compete for every drop of Shinya's cum, eagerly sharing his throbbing member and reveling in their shared depravity. They engage in every conceivable act, from deep-throating his cock and taking turns riding him to simultaneous oral and vaginal pleasure, cementing their new life as a completely debauched, incestuous family.