It was hard to fight a smirk at Graham's comment and he couldn't resist choking out a "Have fun! Don't do anything we wouldn't do!" after them when they finally popped out. He couldn't help himself. The whole Katie/Graham situation was highly amusing.
Soon, though, his attention re-focused on his girlfriend. His arms slipped around her and he pulled her in close, his lips pressing to her forehead as he just held her for a moment.
"I'm glad you decided to stay," he murmured, lips still pressed to her head as he spoke softly, letting his guard down a little. He wasn't likely to let many people see how worried he was about all of this, but Ali was different. He could be a little more vulnerable with her, even if he wasn't admitted out loud just how terrified he was that something could happen to her or to their son.