Both are perfect for each other. MC is an incurable wanker and Misaki is an equally incurable slut. I don't know if the bull appeared by surprise or Misaki called him, either way, let's see what happens next.
@Coledas I doubt she called him. Off the base manga it sounds like she values her freedom to sleep around. I'd assume him coming in and being a tool about her doing that would warrant the same ultimate response she gave the MC about it buuuuuut.... You know...
This is an NTR story with humiliation as one of its essences so I wouldn't be surprised to see that ignored for him.