JF-681 New Sister’s Underwear 27 Yoshimura Sumomo

A younger sister who tags along on a trip with her older sister and her boyfriend turns out to be surprisingly flirtatious in this carefree, boundary-breaking series entry. She gets approached by a regular at the inn, has a private encounter on the balcony, is casually drawn into a late-night tryst, flirts with a boy from another room, and even gets involved in a drunken three-way with her sister’s boyfriend and his friend. Though the story unfolds in a loose, convenient way, her bold and uninhibited behavior is so convincing that it almost feels refreshing.