nah... mother/son incest isn't my thing, not sure how many other guys have fantasies about older women/mother figure.
for guys who like mature, HH already have bunny's mother.

most guys prefer girls young.
personally, i like big brother/little sister incest or father/daughter incest.

I wouldn't mind seeing hero's younger sister showing up for incest, for a defloration maybe?
Sagiri from eromanga sensei would be a good character to parody, ofc with bigger breasts and wider hips for safety concerns, we wouldn't want to break some sensitive countries laws with girls that look too young. gotta aim for that sweet spot of early 20s look