Top-notch, excellent scenario - even her honesty is perfect, and the art - wow! As a long-time gangbang aficionado, this rings all my bells, top favorite! More like this, please! :)
"Why did you this"? Well, why else? It's Hentai, and also it's probably some form of motivation?
Well actually she just wanted to bang a bunch of ripped guys, but hey, at least she's honest with herself, even if she wasn't exactly too forthcoming with them.
Still...They lost? Impossible! Their motivation should have been sky high...Maybe she should have saved the actual sex for if they won, that might have been the trick. The 'reward' pattern rather than the 'motivation' pattern.
According to dialogue on last panel, the swim team lost because of lack of training ... or rather Sensei might have been training them in (koff-koff) activities other than swimming (if-you-know-what-I-mean).
Conclusion: "Motivation" alone does not always compensate for, or substitute for lack of preparation, even in the H-Universe.
"DAYUM!" ... Page 5 depicted (as a certain pinball game stated it) "Total Annihilation!", which means the swim club members have a very long way to go before they can even hope to (a-hem, again) "flip Sensei's switch". In the meanwhile, she rides them to Valhalla and back via Aesirgard, and even taking a left turn at Alberquerque, and she keeps going and going and going. ðŸ˜
And by the close, Asakura-sensei's true intention for the swim club is revealed. 😯 Oh, well ... in this age of 'gender equality', a "reverse-harem" is fine, too ... once in a while. 😉