Hello, I'd like to ask you if youknow this manga, whick I read like year or two back a now I cant find it even thought I'm trying hard

It was about guy who looked after his sister's little child (I thinnk it was a girl) because his sis worked abroad. Then one day he met an old friend of his, that friend cooked them something (atleast I think it was something like that). Then I remember that friend thought the main guy was married and it was his child... When he expained that it was his sister's and blablabla... That friend decided to stay with them and help the one he liked with the child....

I hope I described it right and some of you know anything about this manga
I don't even know if it was just oneshot or if it has more chapters but it was propably just one chap and I'd loe to read more of it

PS: I'm sad, cause I couldn't find it after "LGBT parents" tag, because their aren't actualy her/his parents...

Could it be Family Simulation!!?
The kid's a boy though, not a girl.

Thank you!! That' it! I'm so thankful to you :33

Like I said in the post I wasn't sure if it was actually a girl or boy, but really THANK YOU ♥♥♥