Pls help me find this!
In the story there is two brothers. A dark haired one and a younger adopted brother.
One of them if gonna move away. The older one panicked, ties up the younger one and they do the do.
After this incident the older broth acts like nothing happened.
Eventually they move in together for convenience, romantic shenanigans insue. Younger blond one is seme.

Nevermind
I Finally found it
3-pun Instant no Chinmoku