Locking himself away in a dungeon did sound like something he wanted, but unfortunately, it wasn't all he'd hoped it would be. That was why he was there, after all, but as soon as she motioned him to follow her to a different area, he began to regret his choice. Severus did not do small talk or casual conversation very well, and that was exactly where this was going. He'd probably have to talk about himself, and besides the fact that he didn't like doing that, Pansy was a student of his--a former one, but their only relationship had been as an educator and authority figure, neither of which applied here.
"I was in the area," he responded, never one to stroke an ego unnecessarily; although truthfully, he probably wouldn't have chosen her shop if he'd personally known anyone else in the Alley. In this moment, it was more about choosing between very few options. But even acknowledging that didn't change his mind about being there. He just wasn't going to lie to 'make her feel special.' From what he remembered, she had plenty of minions to do that for him.