Tsuyax2 is in the zone with this series. Being limited in how sexy things can get, the sexual tension becomes subtler and more nuanced in it's presentation.
It's a fucking scene about sweat, yet it gets how to be sexy better than the usual forced anime ecchi scenes.
And it does it all without having weird anime tropes like "accidentally falling face-first into someone's boobs".
This is Tsuya's masterclass in subtle eroticism.