Need help finding a manga

Hi! I'm looking for a yaoi manga that was about a couple I will name A and B. So A had inherited his father's mansion/wealth and possibly business(? not entire sure). He's of high social standing and B I believe was the butler. A had an unrequited love for B but B treated him rather coldly and didn't see him as mature. I think A had this unrequited love since he was young. To prove his worth, A worked hard to carry on the title as the head of the household. They eventually get together and that's all I remember. The manga was very plot heavy/based and had several volumes.

So sorry for my vague explanation! Any help is greatly appreciated!