maybe you can help me.

Im searching for a shonenai. Maybe yaoi. Im Not sure.
There Are two boys, a teenager and a liddle one. one Day they stand infront the dor of a man. I belive it is the brother of There dad. Im Not sure.
They Start to live with him and After a wile, the liddle one Calls him dad. The man looks foraward to, the Teenager to Call him dad , too.
The Teenager confessed his love to him. And After a while, because he wont make to much trouble He calls him dad.
and the older is in love with him.

I remamber, the Teenager Beginn to work secretly, because two Kind are expensiv, He thinks.

Is is a very beautyful story. And I cant find it anymore.
can you help, please?