1. http://www.mangago.me/read-manga/manazashi_no_hayagane/ ch4-5.5 maybe
I remember both stories but forgot the title. Im following this! Sorry not the answer.
1. http://www.mangago.me/read-manga/manazashi_no_hayagane/ may be this starts from chapter 4
THANK YOU!!! YES THIS IS IT
THANK YOU!!!
#2 is by the same author. It starts here: http://www.mangago.me/read-manga/katappashi_kara_zenbu_koi/mh/v01/c005/pg-1/
YES!! THIS IS IT!! THANK YOU SO MUCH!
1. This character was a very diligent teacher, his partner ends up being a guy who is his female student's older brother/relative. And there was a part where the girl's ex boyfriend was stalking her so the teacher walked her home. I just remember this but I know it continues
2. The seme, who is to be named gang leader is deceived by the uke. Uke is actually part of some other gang and is very sick? I'm not sure about this but I remember the ending clearly. The seme begs the uke's dad to hand him over but he gets nervous and accidentally says "Son, may I have your father" or something like that.
Thanks!!