Forced to live with my older brother and his wife, one day I accidentally caught sight of my sister-in-law Aika's big ass, and ever since, her image has been stuck in my mind. In daily life, I find myself constantly aware of her back, the way she walks—especially that irresistibly attractive ass. When my self-control finally reached its limit, I pounced on Aika one day and started thrusting into her fiercely. Facing her quivering, climaxing body, my restraint completely shattered. From then on, keeping it a secret from my brother, I repeatedly creampie her again and again.