He tilted his head down at the nickname, eyes narrowing with a playful smirk on his lips. "You don't have to wait for anything. You're not one of the dogs." As much as she checked the boxes for a Stray he had a habit of collecting. Human strays fell into a different category.
"You're not running because you don't know me very well yet." Will managed a laugh at the comment though. Other than Zemo and Bucky, no one at the hotel really knew what Will was capable of, and the two men only had hints really. Bucky saw him kill Abigail's father in New York (for the second time) and recognized the darkness in Will, but that was him being protective of her. It had an easier excuse to swallow. Even Abigail likely did not have the full details of the games he and Hannibal had played before that night when Hannibal couldn't bring himself to kill him.
"Hmm, you know, I'm not quite sure, but I can be very useful." He teased back.