I remember this doujinshi where the MC is a university student. One day he saw some girls of his school in the act with some teachers and deans.
He decided to not hold back anymore; he started with a girl in a library right in front of another girl, who he switched to right after. Then he goes on, and then he wakes up in an apartment in the middle of sleeping girls; he has his engine in one and his head in between the breasts of 2 others. He got up, found a girl making breakfast, did his business with her, and told her she made good wife material.
I remember it being super high in all-time for some of the biggest of tags, like breast and such, but it was maybe 7~5 years ago.
Thanks for your help !