Lexi's response had him raising an eyebrow and grinning back. "Doesn't seem to me like I'm all that unfortunate," he replied. She was a pretty girl, and it didn't seem like it'd 'hurt his image' to be seen with her. Not that it was something he cared or thought about at all, but he knew how self-conscious other people were at times.
Callum noticed the lip bite and couldn't help wondering at the cause of her nerves. Though he guessed maybe he could figure it out, being new and all. It wouldn't be his first time wandering the campus with someone other than his brothers, but it was still all a bit new.
He walked with her to the door, slipping to the side to catch the door from her and hold it open for her, carefully avoiding getting too close to her personal space. It wasn't like he wanted her to feel threatened by him.
"A little," he responded to her question, waiting until she was clear of the door before following her out. "My brothers both gave me a couple of tours, and I went for a walk the other day to see if I could remember where things were." He gave her a reassuring smile. "Don't worry," he went on. "Between the two of us, I think we'll be alright."