I'm looking for a yaoi;

It's about a boy, 10~ years old. I remember him to be a little weird but that might just be me. He doesn't like to be home/lost his parents. Can't remember correctly now but it is this house where he spend most of his time at, where there is an older guy, 20~. The boy is very attracted to his older guy and he looks up to him. I remember the older guy sleeping only in boxers, the young boy wants to too, but he can't because he easily get sick. I also remember a scene when the young boy ask if he can snuggle with the older guy.

Later on, the young boy gets to stay at the older guy's house, jump in time, the young boy is now 16~ and still lives with the older guy. He's getting sexually attracted to the older guy now and if I remember correctly the older guy isn't that willing... haha.

It's so cute! Must find the title.

Ai no Kotoba wo Uragaeshi the first story?

Oh yes yes! Thanks a lot! 😀