This story is one of the horniest things on this site and I love it. Like "A Summer Fling" and "If a Lie Is Not Told, It Cannot Become Yuri", Ayanero manages to pack a considerable amount of characterization and style into her hentai. It's the cheerfuness and evident friendship between Aki and Kei that really sells this one for me. Aki comes across as somebody who's up for whatever, which makes her jumping Kei less surprising than it otherwise would be.
And Ayane-sensei's tastes aren't mine (I'm pretty vanilla lol) but the enthusiasm with which she draws everything really does a good job of selling how much fun the participants are having.