Harry:
In the Gryffindor common room//You were doing your homework with Ginny.

Ron:
You've known each other since kids//He's ALWAYS had a crush on you.

Hermione:
The library//You were studying for your O.W.L.S and she offered to help you.

Draco:
First year//He was picking on Hermione so you stood up to him.

Fred:
You were an accidental victim of one of his pranks meant for Umbridge. He wouldn't stop saying sorry.

George:
Umbridge/Umbitch gave you detention for talking in class and she wrote on your hand;
Mudbloods have dirty blood. I have dirty blood.
When you came out, you collapsed to the floor sobbing and George comforted you.