This doesn't completely fit your description, but might it be this one?
http://www.mangago.me/read-manga/pet_oshigotochuu/
Also, if it helps when the smaller one announces he'll be leaving the older one realizes he wants him to stay. The manga doesn't have a huge amount of detail so there's a lot of white space, but the drawing is really good in my opinion. It's also not a very popular or well known manga unfortunately...
Unfortunately it isn't, but thank you anyways!
Ah, I wanna know that too
Not sure but maybe this one http://www.mangago.me/read-manga/itadakimasu_gochisou_sama/
this one matches that description as well: http://www.mangago.me/read-manga/recipe_no_oujisama/
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Thank you so much, but unfortunately it's not. The plot is extremely similar though, but I think the detailing was a lot more refined, but had similar shapes and stuff. I think the older one also has dark black hair as well
Unfortunately it's a manga that's not very well known I don't think
So, I completely forget what manga it is and it makes me really sad/irritated. It's one where a younger boy is looking for a place to stay because he didn't have a home. He was then let inside and everyone really liked him and he began doing housework for them, but he was staying in someone's room and that person began to fall in love with him. There's I think two couples in the manga. Both are roommates. I think it's about 6 chapters? The smaller one also has slightly wispy hair and the other older one has straighter hair.