“I’m sleeping…so you can do whatever you want to me, Onii-chan…” It’s been half a year since Tetsuyuki and Ruri became step-siblings, but they still can’t seem to get along. One day, Tetsuyuki catches a peek of his sister’s underwear when he finds her taking a nap in her room. “She’s cute when she’s quiet,” he thinks while stroking her thighs and licking her budding breasts. Ruri’s all red and letting out sweet sighs, but she remains fast asleep. “She can get wet even asleep, huh?” Tetsuyuki slips his fingers in, and only when he enters Ruri himself does she let out a faint cry of pleasure…