I wqs reqding a yaoi when my phone died and i cant remember the name. It was about a serva...

I wqs reqding a yaoi when my phone died and i cant remember the name. It was about a servant called Ein (i think) who was called to serve a young master of a noble household. He also had to have sex with the master of the house. The young master was actually the son of the previous masters mistress and so didnt really know anything about being a noble. He was also reqlly innocent and liked cake. He had a crush on Ein.