Locker Shoujo Nanami-chan [English], by Sugiura Sen

Biribiri, Zebon20 and PureEnergy bring us a funny uncomplicated share, thank you very much
We start with a highschool girl masturbating in a locker while peeping on her classmate having sex. Turns out that was anal sex, and the classmate knew and was putting up a show. Naturally, she is going to introduce our female MC to anal sex with her sexfriend.

Take it or leave it, as you like, me, I enjoyed it ^^

Actually, I have an embarrassed question. That story reminded me of an old manga I started sharing on Hentairules, many years ago, however I gave up on it after the following chapters went loli. I remember that was translated by Tonigobe.
Would it sound familiar to some of you guys ?
Me, I just don’t manage to remember its name.

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