[m]I'm looking for a manga I cant remember the title... it was about 2 couples, the ukes were both twins and one of them worked at a daycare. The one that worked at the daycare went on a date with the seme, pretending to be his brother, and falls in love with him. The other uke falls in love with the seme's brother, who has a kid.

It is Kuro x Koi by Takagi Ryou