At this point, even after sexy payback time, the only.thing that might restore the strength of the Swimming Club's male members is probably some seriously advanced martial arts training, e.g. one of the Hokuto or even Nanto techniques of the 'Fist Of The North Star' continuum. 🤔
*beat*
And chances are even if they did so, it will only result in more (cough-cough) "sustenance" for the girls.
Ah, part 3!
Well, in the end, they're still essentially being 'milked' for their semen and uh, potential, but at least it's reached a point where the girls actually ask politely and do things to please them too (Like the nekomimi on the last page).
At this point the male swim team is basically a lost cause, but hey, may as well get the most out of it, I suppose.