A wholesome yuri like handsome girl and sheltered girl will do the trick
It's a 6 chapters school life manga with smut . it's 1 blonde girl and a black haired girl , i just remember that the girl with black hair liked her since they were in kindergarden
So basically shes a highschooler that has a fetish of big butts and she goes early to the train station to look at butts. And one girl caught her but didn't mind since she is à girl. I don't remember much but after that they had sex in the public toilets and another girl was listening them while they were having sex
Found it the name is : "Watashi no Shumi tte Hen Desu ka?"