>>91452537>more like a teenLegally speaking, adulthood begins in the mid to late TEENS in most jurisdictions. Biologically speaking (among humans) adulthood usually begins in the early to mid teens. From the apparent state of their development, the sisters are probably late teens to mid twenties. Few societies would bat an eye about a woman like Ashi pursuing a relationship with a man like Jack. Except for the monkey snout thing. What's up with that, anyway?
But at any rate, Ashi needs emotional maturation and experience with the world. She's an adult who will be taking care of herself, so parental love is not appropriate here. A mentor would be appropriate, and Jack has already started to drift into that role. A lover would not be out of the question, but it probably wouldn't work well story-wise.