Gokuusu Mizugi de Oka●retagari ga Kakusenai

"Sensei, you promised to have sex with us if we became national champions!!"

The swim team advisor Natsumi jokingly offered them sex if they won, but the boys took it as a serious promise, so they pushed themselves desperately to take the championship. Now they won't let her off the hook.

While Natsumi continued resisting in va...