[Sid Alice] Your Back (Ecchi na Karada no Tsukurikata) [BoundaryTL]

Competitive swimmer Yuuko drags her classmate Naoki through one last grueling set at the school pool, then rewards his two-second-behind finish with a hands-on 'check-up' that spirals way past checking his pulse—her slick competitive swimsuit barely surviving his clumsy curiosity as her stiff little reactions betray how much she wants him to keep going. What starts as teasing about her small breasts and racing heart ends with them joined for the first time, her tanlined body arching as she gasps that they're finally connected. By the time they collapse in the locker room, she's already vowing to train him harder from now on—and to pay him back with her special massage after every ten-kilometer swim.