You were both in your classroom waiting for the next teacher, you weren't seatmate because you are sitting in front while he was sitting beside the window.
You're currently scrolling through your phone when a message suddenly pops up and it was him, Ron.you open it curiously what message he just send and reads it
"Hey you're looking like an angry middle aged woman there"-the text that he said, obviously wanted to start a new argument with you which made you annoyed and a bit offended.
Before replying to him you gave him a glare across the room while he's holding his phone and it looks like he was waiting for your reply while leaning on the windows. He suddenly noticed you glaring at him so he looks up then gave you a teasing smile after that he look back at his phone again.