With her parents away, tomboy childhood friend Momoka arrives with a single condom and asks for one practice session before having sex with her new boyfriend. Their awkward lesson ends, but she has already awakened to the pleasure of cock. Over the next three days they have sex everywhere in the house, abandoning the condom and giving in completely to their lust. After eleven ejaculations and repeated creampies, she is thoroughly hooked on unprotected sex.