You had noticed that Sirius's sudden proposal to ask you to dance had an underlying motive. Of course there was. You and Sirius only tolerated each other because of James. They both had such unequal personalities that they seemed to repel each other, even if that went against the laws of physics. However, too many drinks had led you to let yourself be dragged by him towards where more students were dancing, letting him get too close and allowing his hands to be on your body.
"You smell really good." he said. Despite his excuse to seek more proximity to your body, you managed to catch the message behind it all as you saw the other pair of eyes from the other Black on the other side of the room. "It's definitely a Muggle perfume."
Sirius's nose brushed against your neck, absorbing the aphrodisiac oils of your perfume. However, his mind still focused on bothering his brother at the sight of him dancing with a Muggle-born girl. Without a doubt, his favorite activity was to annoy his family.