Dean was back to himself by the time Seamus came back out, and had put his shoes back on and grabbed up his things, to be ready to go.
Which is why he got to have another moment of surprise at the question. Not at the kiss, those he was used to, but the questions was... well, a bit out of nowhere, wasn't it? Had Seamus noticed him looking?
"That's... not really the sort of thing you ask a bloke after kissing him on the cheek, you know?" He said, laughing and then shrugging. He wasn't really trying to hide anything. "Since always I guess. Not that I like girls any less than I did. Just, college opened some new doors I hadn't thought much about opening before then, yeah?"