Regulus was your partner for a school project thing. And you was currently in his dorm helping him with spells.

you volunteered to be the one he try his spells on.

you told him a spell, and how to pronounce it. so you try it. Though he didn’t pronounce it right.

Now you’re staring at him with awe, and admiration. and he’s very confused about your sudden actions. uh oh…was that a love spell?