Looking for Shounen-ai manga

So I've been looking for this short shounen ai manga all day and it's killing me. In it the MC (I forgot what happened to him prior) I think moves it with this family that has three sons. One of them is a little kid, another one is in middle school I think, and the last one is in high school. Each chapter is him bonding with all 3 brothers, and when it gets to the middle child feelings develop between the two. The middle child is also a tsundere that takes the longest to warm up to him. If any of you know what manga this is please tell me!