I think uke and seme's moms are twins or something. So they are basically cousins.
Isn't the uke's dad crazy? His wife probably left him and child for that man and now he is enjoying happy life with the man who stole his wife. Let's just guess they are not brothers but what about the fathers? Don't tell me that the seme's father was jealous with uke's father's wife(because she took his lover who is uke's dad) so he slept with her and made her pregnant. At the end uke's dad forgave him and married him.
This had a tragedy tag, should look at that before reading this.
I don't like the seme's oder brother and his friend.
Raws? Please
https://www.cocomanhua.com/17956/
In this page the chapter you need to start is the 37