So Stiles wasn't sure what to think of the idea of hanging out with Cora. He wasn't worried about her threats to hit him. After all he was used to spending time around Derek and Peter who threatened him a lot more and were a lot more believable. Especially Peter.
It just seemed to be a family thing with the Hales.
And yes, he probably was an idiot. There was a lot of people that would tell her that.
He'd left without telling anyone where he was going because he just didn't want to hear what Derek would say about him meeting his sister for coffee. It would probably involve threats. Once he got to the coffee shop he ordered his own drink so when he sat down where Cora was he had a really big cup of really strong Mocha.