Herbology.

It's never been a class he likes. He's not too sure why he took it, well, he was quite fascinated by the properties of different plants and their abilities in potions.

He likes the proud feeling in his chest when he is able to use his own supplies for an assignment from Professor Slughorn. But he was not here to ponder about his favourite subject.

He scans the area for Pandora, his best friend, she was in his class. He can't help the frown that crosses his face when he sees who she's with. Mind you, Regulus has no problem showing his dislike for people, and he doesn't necessarily need a reason for it either.

If he dislikes someone, maybe they should just get more likeable?

"Ah, Dora, why're you with them?" he asks when he catches up to the two, annoyance thinly veiled behind his otherwise friendly tone.

Pandora gives him a warning look but he'd much rather ignore it. He looks straight at the other person. "Why are you here?"