Basically they hate each other but then there mom and dad end up dating so eventually they end up living together and then they start to tolerate each other until they admit that they like each other then the mom and dad end up pregnant
This https://www.mangago.me/read-manga/what_can_t_be_broken/
Jumping the Geon?
Basically they hate each other but then there mom and dad end up dating so eventually they end up living together and then they start to tolerate each other until they admit that they like each other then the mom and dad end up pregnant