I am trying to find some Hentai i've read on fakku a while back when stuff was still free.
It went something like this:
>Teacher in school infirmary
>Sees stunning girl
>Masturbates in the office afterwards
>forgets (or looses, dunno) panties
>girl notices it
>they start the heresy
>sweet tribadism
>turns out: girl from the infirmary is skilled
pic not related
Op here
I found it
It's Utsusemi Zenpen by Maruta
/thread