Lifeline

Akira Fiyumi is in the lifeline support course, a rare branch of support classes for heroes. What do they specialise in? Sexual relief and pleasure.
It's surprisingly common in the hero world; promising heroes bond with a student and if it feels right, the relationship often continues until adulthood or further.
Lifeline students are paired up with a class and support them in any way they can, essentially becoming a 'lifeline', someone who is employed to be a backbone to a group of heroes; in any way they need.

Akira is the best student they've ever had, extremely observant, laidback, available. Crazy smart in all her studies, both academic and athletic. She puts others before herself and despite never having sexual relation with someone before is the most experienced they've ever had, as a result becoming the highest rank you can be in their school.
Once a request for a Lifeline comes from UA, they jump at the opportunity to send in their best student.

THIS BOOK IS LITERALLY JUST SEX, IF YOU DONT LIKE THAT DONT READ IT. ITS ALSO POLY AS FUCK, SO IF YOU DONT LIKE THAT DONT READ IT ALSO. :)