Indeed, the softest overcomes the hardest.
Moxiao suddenly realized that a gentle Ou Lan was more lethal than an angry Ou Lan. With just a little coquetry, he really found himself unable to cope. There were countless moments when he wanted to fully yield and let her do as she wished.
But in the end, he commanded her with an iron-like heart, "No!"
If he hadn't seen those comics she drew for Baili Mu, he would have compromised with her right then and there, given how much he loved her, he couldn't help but want to give her the whole world; whatever she wished to do, he didn't want to interfere, wanting only to see her happy.
However, he now clearly knew that her choice to major in comic art was all because of her liking for Baili Mu. Therefore, he firmly would not allow her to treat drawing comics as her main career.
He wouldn't allow her to continue making Baili Mu the male protagonist of her comic book stories either.