I know he rape her, but we're reading an omega verse, I think he didn't have the capacity to reprimand his alpha instinct, and she was traumatized for the event, but if we carefully watch his face when his looking at his child, it looks like he's in pain too, and yes, his threatening her but if she's that scare he has not a choice, we'll I hope am not wrong and they live a happily life together after all that traumatized experience