HMN-914 Her overconfident younger sister gets a special treatment that heightens sensitivity, leading to repeated intimate teasing and a sudden bare insertion. In the end, her reactions become dramatically intensified, resulting in multiple climactic moments and 16 finishings. Sumire Kuramoto

Her younger sister is a super outgoing, extremely cheeky type who always looks down on me whenever we meet, saying I’m not good enough for her sister. Then one day, while preparing for a swimsuit contest, she was wearing a high-cut swimsuit… and once again, she started acting smug and mocking me, so I finally reached my limit. I secretly applied an arousal-enhancing lotion to the high-cut swimsuit and used close body contact to get back at her, pushing her to the edge. She insisted there was no way she could feel anything from a shy guy, but just from the rubbing and pressure, she became completely soaked. The friction from the high-cut swimsuit made her even more sensitive. In the end, things escalated further, and she climaxed immediately after being teased for so long.