It was a yaoi and I think it might've been a part of a series of one shots...though I'm not 100% sure of it. It was a student-teacher relation, with the teacher being the uke. The student had fought with his dad or something, and his teacher took him in, offering him a place to stay temporarily. There was one scene where the teacher gets called out by a bunch of delinquents, and the student rushes to go save him but when he gets there, he sees the teacher holding his own in his fight. Turns out that his teacher used to be a thug too. His teacher also knew his dad.

Hope that is enough details to find this manga! Thank you

It sounds like Free Punch to me. 😃

[img]http://f.ptcdn.info/599/007/000/1374672235-rayflovass-o.jpg[/img]

Yes it is!! Thank you so much 🙂