Justin's fork stood still in the air and he stared at Susan, utterly shocked. "Did you just.." He snorted and put his fork down. "You know, that would apply to Ernie a lot more than myself. He's the fabulous one you know." He said, giving her a smirk. "But I can't see how five would work together and I especially do not want the visual image of the 5 of us Hufflepuff blokes together either, woah." He shook his head and blinked.
"It would require an insane amount of trust though." He pondered, tilting his head to the side. "Besides..I've never been with anyone else than Seamus." He said. "Ever." So he wasn't too sure about that whole having sex with more people than one.
He frowned at her explanation about the fighting she was having with Seamus. "He is grumpy sometimes." He agreed with a nod. He never really knew in which mood he was going to get Seamus and he was fine with that. He could deal with it pretty easily by giving him plenty of space.