Need help!~

So, I'm looking for a yaoi/shounen-ai manga - I don't know if it is completed or ongoing.
The story goes like this:
There are two friends and they find out that their older brothers, are in a physical/romantic relationship. So, one of the friends obviously knew about it and didn't say anything about it until the other friend found out. And the friend that knew about it, is in love with his friend, but the friend got a girlfriend and had been dating for 3 years then broke up.
Idk, my explainations are bad, pls cope with it if possible! :)

Btw, I THINK the mangaka has ALMOST the same art style of Junko-sensei, but I'm not really sure?

THANKS (๑•ㅂ•)و✧