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Midievalfantasy asked a question

I read a manga a long time ago and forgot to tag it or put it in one of my lists. Here's what I remember:

Two brothers are basically sold to a rich family, one to the father and the younger brother (main character) to the son. The younger brother believes he's just a paid playmate, until they get older and he sees his older brother with the father. The older brother, ashamed of being seen, tries to end his life. The son tells the younger brother that he belongs to him and then the younger brother tries to get away. The son and younger brother fall and in love and the older brother is shown to have survived his attempt.

Anyone know the name of this manga? Thank you!