I was going to say same. It doesn't seem like he has control against her heat. The first thing he asked her when they started living together is to get supressant. As a doctor you would have faced others with heat. So he must have something prepared to safe guard himself and it failed with her. His first instinct after meeting her was to talk discuss with his head doctor. He had come on his day off when he met his recently ill child running in cold for help and mom who was sick and alone struggling in poverty. His mistake was thinking only about child and not mom's welfare. I don't think he thought through of how the whole bonding process was traumatic for her which from my limited omega verse experience seems like natural to them but is actually kind of fucked up with choices taken away from both party. His penance would be undoing the bond and possibly help ppl like her including this girl who became young mom at young age. For that he needs to first understand her and help her complete education so she can stay anywhere she wants.
Is it just me whom somehow took pity for both of them.
I pity Nanase where she have PTSD due to rape. it is something that you can not brush of easily. At the same time i am pity the doctor he wants to take responsibility over what happen but since the experience is forced and unintentionally its difficult for both of them.