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Kanojo no Ane’s Kossori Koubi: Ienai Kedo Yacchatta!
彼女の姉’sとこっそり交尾 ～言えないけどヤッちゃった！～
A young man finds himself unable to resist the temptation of his girlfriend's older sister. Despite being in a relationship, he secretly engages in a physical affair with her, unable to confess the truth to his girlfriend. The sister, aware of the situation, continues to seduce him, leading to a tangled web of lies and hidden desires.
The protagonist struggles to maintain his facade while juggling his feelings for both women. As the secret encounters escalate, the risk of discovery grows, threatening to destroy his relationship and expose his betrayal. Caught between guilt and lust, he must navigate the consequences of his actions.
