This is always my first read on every update
http://www.mangago.zone/read-manga/whose_baby_is_it/
Lol me too at first i dropped it and then after a while i picked it up again...in the beginning as u said the seme seem to be cold and kinda not care about uke but actually he cares the uke...For me i love the seme from DOCA more the tanned daddy is really madly in love with the uke and so caring and handsome definitely my type(づ ̄ ³ ̄)づ
I searched for it also and I think this is it
http://www.mangago.zone/read-manga/raising_a_child_and_falling_in_love/

Haah I'm just reading this to see wowo.
He's sooo adorable ╥﹏╥ he's my favorite manwha baby (▰˘◡˘▰)