This should get a sequel:
One year after the ending, you reunite with your family(either Ellie and Aunt, or Mom and Kira, or all four). You have more children as time goes on (can show memory of birth, the jump to present?)
25 years later; You raised the children 1 son and multiple daughters. MC is now 45(ish), son is 24(ish), daughters range from 18-23 (except teacher's kid, she is 25).
You were the perfect father, no monkey business...yet. Everything is fine until you find out your old teacher is dead (some dramatic car accident or something), your long lost daughter shows up. She discovers the ongoing relationship(s) you have and having d issues, acts...
Here is the kicker, you can choose to either be the son or the original MC. If you choose the son, you will play as the original MCs son, the original MC would die (maybe in car with teacher?) and then you have the slow build with the other characters. Or the Original MC, son could be priest trying to 'save' dad while teachers daughter corrupts the MC ("Good vs Evil" thing) into A LOT OF MONKEY BUSINESS.
List of kids and ages:
M: 24(M), 22(F), 19(F)
Kira: 23(F), 20(F)
Ellie: 20(F)
A: 22(F), 20(F)
Teacher: 25(F)
Alice(if wife): 23(F), 18(F)
What do you think?