"You are a terrible person." He shook his head at the thought of all the blackmail Dean likely had on him. "I don't even like to think about how you could ruin my life if you ever stopped putting up with me." For more than one reason, and potential blackmail wasn't high on the list. "I've got just as much on you, though. You're not immune from embarassing mistakes, handsome." He didn't even notice that somewhere during their two week bet he'd picked up Susan's nickname for Dean.
Seamus briefly considered compiling a list of Dean's fuck ups, but decided he couldn't be bothered. "You are a god in the kitchen and I bow down to you," he teased instead.