She was giving him an impromptu tour of campus after they'd been talking for a good part of the afternoon, right before she left to visit me (her boyfriend). She told him she'd have to leave to go pack, and he followed her because he wanted to see a dorm room and continue their conversation. That is, obviously, not what ended up happening.

It's the part of the year where meeting new people doesn't raise as many red flags, and since he's in our age group, it wasn't out of the ordinary.

I know the girl. This is an insultingly condensed version of the story. Suffice it to say, she's not stupid.