My big sister's boyfriend might be my type... Her mischievous little sister keeps teasing him, flashing her H-cup breasts. She says with a cute yet bold smile, "You use condoms with my sister, right? I'd let you go bareback with me~." Unable to resist her temptation, he ends up giving her a creampie. Just one time isn't enough—she keeps begging for more, making him creampie her repeatedly. Even though his girlfriend is sleeping right next to them, he desperately wants to thrust inside her bare. A risky, secret baby-making affair unfolds, filled with fear of getting caught.