Someone. Help!

I'm looking for a manga. It's a yaoi involving a child who was hired by a rich family to look after their spoilt kid. The rich kid is nasty to the child who's working because his parent is sick and has too many mouths to feed in his family.
Then over the years the rich kid forces him into a physical relationship with him.
When they reach high school the child befriends someone but not soon after that the rich kid finds out and separates them...

I think there's more...