Puck had lovers who liked gifts, so Loki's ego wasn't new enough to be surprising. If anything it fit perfectly for what he knew of Loki's personality. It reminded him of the masquerade in the briefest passing, in that they were working together to enjoy something. As Loki held onto him, Puck kept his rhythm steady. He felt their connection and the strength in both Loki's grip and her emotions. The trust she was showing, the comfort she was sharing. Puck's heart felt like it was going to metaphorically ignite.