Seamus didn't smile in response to her sweet tone - it was obvious from her words she didn't mean it, she was sticking to her flat wrong opinion that Justin had changed his schedule for Seamus. He knew from experience that arguing with Susan would get him nowhere. Most of the time he was able to let it go, but today he was feeling belligerent. "I think I'd know, rather than you. It's just sex, and he's not that desperate for it that he'd change his schedule for it." He was being blunt - and possibly a little unfair to Justin - but he didn't care.
"I guess we'll see." He pushed his food away, fingers itching to get his cards back out. Susan would notice, though, and Seamus was inclined to damn all aurors and their observational skills. There was really no graceful way out of this conversation, but Seamus was ready to be done with it. "I'd better get back to work."