[Gokunama Kinringo] I'm Secretly Doing Lewd Things with my Sister's Friend [Tabunne Scans]

An innocent schoolgirl in a loose shirt and bow tie secretly flirts with her brother's friend, promising not to tell anyone while teasing his eager body. She drags him onto the bed, his first release and loss of virginity unfolding as she declares she won't let anyone else have him, her leg lock and ahegao expression heightening the tension. The playful yet intense encounter blends teasing dialogue with passionate climax, keeping the reader hooked on the secretive, forbidden romance.