The Slytherins were planing on having a party, you obviously went. (Draco at the time is your best friend.)

Before you got there you put on some of your Pheromone perfume.

When you got there you greeted people.

You saw Draco, you went up to him and hugged him,

“Hi!” you said

“Is that a new perfume? he asked smelling you again

“Yeah… you like it?” you asked curiously

“Yeah…. Smells delicious….” he said back