Clary: *smiles* Okay. So I can keep it? 

Alex: *smiles and kisses cheek* Alright.

Billie: *gags* too much corniness. Logan! Save me!

And I could see Billie waving back like, and then just keep walking past her dorm and going to Clary and Logan and being like "Yeah, I'm hanging out here for a bit. I dont want to see more of my brother than necessary."

Because Alex cleans up before Billie comes back because she does the same for him.