Dean was busy watching his own feet as Seamus babbled, largely so they didn't intersect with his friend's and trip them both, since Seamus was hauling him around. Dean half wanted to ask if Seamus wanted to put a bloody leash on him or something. But he didn't really mind, unless he ended up tripping and meeting the pavement close-up. Then he'd mind a bit more. He grimaced in sympathy as Seamus mentioned candles though. There was nothing more traumatizing than proof that your parents were romantic-minded still. At least Seamus didn't have a million siblings running around to give proof that his folks still had romantic dinners. And after-dinner events Dean never, ever wanted to contemplate if he didn't have to.
Dean was worried about going back to school, and what was going on, as much as anyone in the D.A. was. But Seamus' enthusiasm was infectious, usually, and he hadn't put up a fight about going off to a pub, telling his family he'd stay with Seamus and be back tomorrow to pack up and get ready to go and all. That way if he managed to let Seamus get him pissed, he wouldn't have to listen to his mum about it. Or Amber, for the matter. She had an uncanny ability to sniff out when he felt under the weather the next morning and come and yell at him until his ears wanted to bleed. He loved her. But he thought it might be worth getting his wand broken to cast a silencing charm, once in a while.
Plus Dean generally wasn't that hard for Seamus to convince to do things, anyway. He tended to go along with minimal protesting, even if their more ill-advised outings and antics were usually Seamus' fault to start with, at least.
"You'd better not find one, since I'm staying with you and I don't fancy playing lookout in case your dad comes to check on you or something," Dean answered dryly. He wasn't half the flirt Seamus was, but he did all right, usually, and he didn't mind chatting girls up. But he wasn't the one night stand sort, and he didn't see much point in talking to girls he'd never see again, since they were leaving for school in a couple of days. (Granted, not being a one night stand sort was probably due, in large part, to the fact that he lived in a dorm he shared with his friends, or at home with his large family. It didn't leave many options. But he was more the faithful sort anyway, once someone caught his fancy.) "If you wander off to snog some girl, I'll tell her you have a wife at home after a gunpoint wedding when you were sixteen and you have wheat-headed little kids waiting at home," he threatened, walking in next to Seamus and stopping, looking around the dimly lit put and then nodding toward a table near the bar questioningly. "Good?"