Seamus shifted to nudge Dean with his shoulder. "She hates me," he said, his tone an exaggerated whine. "But I don't blame you for it handsome, don't worry." He nodded. "Susan's right. She's far worse than I am." He did try not to distract Dean from his work - unless it was necessary. Sometimes Dean forgot that eating and sleeping actually mattered and then Seamus had to take matters into his own hands.
Seamus sent the finished plates of lasagne away to wait in his sink, amused by how well they worked together without any of them needing to say anything. "We all put up with each other," he said, as if that decided things. "Even when we're being grumpy, or ruining perfectly good strawberries with vinegar, or being annoyingly good at winning bets." This last he said with a look at Susan who had still - somehow - managed to hold her tongue about the two of them!
"Come on, Susie. We all know you've got a Gryffindor side." He waited until she'd tried the cookie, then reached for one of his own. "Mm. Lemon and chocolate. You both spoil me." The cookie was as good as it looked and he gave Dean a wide grin. "Perfect."