MIDA-686 Yuto, who loves to ejaculate, and his frustrated J-cup sister play newlywed cum-in-mouth role-playing game.

[13 Rounds of Cumshots Between a J-Cup Big-Breasted Older Sister and a Super-Potent Shota] Yuto is attached to his older sister, Mitsuki, who lives nearby. One day, when his parents are away, the two are left alone at home. After playing innocently, she takes off his dirty pants and a huge cock is revealed... Mitsuki gets turned on and can't resist trying it, so she suggests playing "marriage." "Put it in here and move your hips... that's right... ahh...!" As she gives him a lesson in sex, the super-potent boy discovers the pleasure of ejaculation and awakens! The older sister, completely captivated, agrees to make a baby with him while still in her dress, and it's so erotic! No matter how many times he cums, he stays erect, sucking on her breasts and spurting cum inside her without stopping...