It seems pretty common for izakaya staff to go out pickup. Their success rate is surprisingly high, and conversations tend to flow more easily than expected. Perhaps it's because they look serious and responsible, as if they're always on their guard. When someone like that suddenly gets hit on, they might instinctively respond with a cheerful "Woo!" and things quickly progress. Aya initially thought, "There's no way I'd fall for something like this," but she ended up agreeing much more easily than anticipated. When he asked if she wanted to go back to his place since she was tired from hanging out, she immediately said yes. Realizing how simple it was to get her to come along, he thought he should've invited her over and said goodbye much earlier. He felt like he'd wasted some money. Next time, he'd be more careful.