[Locked] Highschool manga

I am looking for a manga in which one girl is in highschool and I dont remember the circumstances but she is fucked by the members of a club with the door a little open and her friend on the other side in school.
In later chapters her friend on the other side of the door, 1 more girl and a lot of boys get into an orgy in school.
Even more along I remeber some scenes on a podium in front of the whole school, then they graduate while pregnant.
I dont remember the name of the manga , so if someone can help me I would really apreciate it.
Thank you in advance.