If none then it's okay.

http://www.mangago.me/read-manga/papa_datte_shitai/ This is the only one I know of that fits the description

http://www.mangago.me/read-manga/kozure_ookami_inoue_satou/ I guess this one is like that? (semes child gets a lover)

These 2, although they are short the first one is about the father and the next is about the child when he grew up http://www.mangago.me/read-manga/koishite_daddy/
http://www.mangago.me/read-manga/love_kids/

A list to ease your search and a link to a continuation story from the list (that a bit similar to your description), feel free to recommend and follow the list, enjoy
http://www.mangago.me/home/mangalist/784543/
http://www.mangago.me/read-manga/himitsu_no_love_sensation/

There's one comes to mind where the uke's dad had a male partner(that has also a son, younger than the uke [the son seme likes the son uke and calls him onii-san) but I forgot

Aahhh, I remember that one too, but can't remember the title, I think I dropped it because the seme was quite forceful

True