sameee i love this trope, i read a novel recently that was just like that but he wasn't really taking care of the boy since he adopted him with bad intentions from the start and the story was lowkey just smut.
although my top tropes are son × father or younger brother × older brother but always from the younger gong pov and it is soooo hard to find (crying) it is specially good if the younger brother/son became twisted due to neglect or an inferiority complex! (and they are super aggressive yk?) and even better if the shou looks like a gong!!! i read a QT story that had both these tropes and it was so peak TT going to reread it rn
You need to give me the novel please I beg
Have u tried the FathexMCxSon?
They're full of Drama
oh honestly only the start is incest and it is pretty deprived but the name is "调教欲望都市（总攻NP）" there's a translation by the title of "L*st Guidance City" but i read in chinese so i'm not sure if the translation is good, also the kid is intersex so idk of you are into that.
in case you are talking about the QT novel i mentioned after, it is called "F**k Those Tyrants" (干翻那些霸总们), i also read this one in chinese and afaik there's no complete translation in english, tomato soup, the author, also has an orthopaedic (incest) collection in chinese and it is pretty okay... i enjoyed it so i'll share ;P it is called "[总·攻]骨科合集[快·穿]". btw all of them are from the gong's pov since i only read 总攻 (how do you even translate this) so there's that.
Father × son is one of my fav trope especially if the seme is the older one who is taking care of his son, so peak