Even though Machi loves her boyfriend, the timing just never seems right to have sex with him. She thinks she'll do it Itsuka, but she just can't make up her mind. Then one day, she meets her boyfriend's brother, who seems a bit of a bad boy. Despite appearances, he's actually kind and gives Machi, who has a headache, some medicine...and when she wakes up, she finds herself tied up. He gives her an aphrodisiac, and Machi orgasms over and over again from the pleasure she's never known. Before she knows it, she's become a creampie urinal.