Eh, so she has tear ducts, but not something that can be easily called a "heart"? :0
This isn't the first manga I've read where a woman takes a bath with an unrelated child as old as Takahiro, but it still seems weird. I know Japanese culture is more open about nudity, but if the kid's old enough to be embarrassed about it then that's probably too old. Alpha certainly seems to have her regrets. xD