After giving Susan a one-armed hug back, Seamus kicked out so he was lying on his back, staring up at the ceiling. "I can't be losing weight," he argued, even though he knew he was. "Between you lot, mam and Romeo in the kitchen I'm pretty sure I'm eating more than my three square meals a day." Well, that was a downright lie. Seamus never really bothered with breakfast, and it was pretty rare that he remembered lunch - but that wasn't the point. If he packed away food at night, he ought to stay more or less the same weight.
He brought himself upright again when Dean neared - just in time to flick water at the back of his neck. "Oi." There was no real heat in the objection — after all, what was wrong with being a 'great thing', even if he did come in a small package? He grinned and splashed Dean again before hastily doggy-paddling his way to the side of the pool. "Nothing wrong with my package." The joke was too easy not to make, and he hauled himself out before anyone could retaliate. "Think I'll go get that ball now," he said, glancing over his shoulder to make sure no one was following.
He was back a few moments later, though he did stop at the entrance to the changing area and made a show of looking around for ambushers. Then he chucked one ball into the pool and carried the other one over, keeping hold of it as he slid back into the water.