Hayami Remu (20) is a cute, fair-skinned, slender college girl with a youthful face. She's been in a smooth, well-established relationship with her boyfriend for over two years. However, her boyfriend is extremely weak with alcohol, and her senpai, fully aware of this, deliberately gives him strong drinks for amusement. They start drinking around the kotatsu, but the boyfriend quickly passes out from intoxication. The senpai calls out, "Hey! Wake up! Did you fall asleep?" but gets no response. Seeing this, he starts groping Hayami. Because her relationship is going well, Hayami initially resists firmly, keeping the senpai's advances at bay. But he persists relentlessly, sliding his hands between her legs and licking her neck. The thrill of doing this right next to her sleeping boyfriend drives the senpai wild, his breathing growing heavier. Though he tries to suppress his moans to avoid waking the boyfriend, his pleasure overwhelms him, and his sounds grow louder and louder. Despite feeling guilty toward her boyfriend, Hayami can't suppress her own desires any longer and finally allows bareback penetration. Being fucked bareback by another man right beside her boyfriend is irresistible. In the end, she's creampie-filled, worrying, "I wonder if it'll be okay?" while the senpai cheerfully replies, "It'll be fine! Just wash it out with the bidet!"—a story of innocent-looking cuckoldry.