Eric was lounging, as per usual, and observing the going-ons at De Final, when the alien scent struck him. All the more alien that it was not a Time Lord scent, not anything he'd smelled before.
There was no attractive quality to it, it was simply different, but different made him curious. And when he noticed that the person who that scent belonged to was about to head back out... Well, of course he was by the door in the next few seconds, and smiling invitingly. Inviting smiles looked scary on him, he'd been told. "Leaving so soon?"