This is just standard mind control hentai but even though there is technically no tools or supernatural means to do so. The coach simply uses the girls' naivety to his pleasure. It's kind of too bad that the girls offer no resistance or hesitation at all and they all just went whatever bs their coach has said. I'd rate this higher if the sports-science theory is presented better, and the girls should have a little doubt with the theory (but this is hentai afterall Lmao).
I'm not a fan of humongous, massive ass and tiddies. But pseudo-mind control is also good. It's a nice change of pace to not rely on mind control powers for once but to convince them with whatever bs coach-kun has formulated: "sports-science theory".
