Looking for a couple yaoi mangas/ I took these off of yahoo answers with the ones that weren't found but sounded good.

The setting is in a high school.... I don't remember much,but there was a lot of sex scenes... I believe that at the end the manga... the characters are on the school roof and having sex, one of them introduces a flask, I believe inside the other and tells him he can see inside his anus

'm trying to find this teacherXstudent yaoi.
the student saves this guy from a gang by beating them up. the guy thanks the student, and the student says that it's no big deal cuz he likes to pick fights anyway. the guy gets disgusted and says he hates violent ppl like him and walks away.
the student is p!ssed and goes to school to complain to his friends. then he finds out that the guy he saved is actually a teacher at his school. the teacher treats him like crap but is nice to everyone else.
the gang the student beat up comes back for revenge and kidnaps him. they take him to a warehouse so that they can rape him and make a porno out of it. the teacher comes to save him, and you find out that he actually used to be a ex-yakuza and he beats the crap out out of the gang members.
they have sex in the warehouse (of course) and i remember the student being handcuffed to the wall or something.....he might have been drugged with aphrodisiac too.....

THANK YOU! 😀

Not sure about the first story, but...

2nd story: Kibun wa Joujou! the 5th chapter =)