He could for a moment but Puck was back to focusing on what Loki was doing as she changed positions and grinned briefly at the skin on skin contact of their legs. When her hands explored and then found purchase, Puck's back arched slightly as he gasped. He saw the logic play a moment later and lifted his head from the bed long enough to look at Loki in a mix of affection and entertainment.

Puck had been turned on by the time they were finishing up undressing each other, but his emotions mixed with his arousal made that more obvious by the time Loki had decided what her response would be to his pleading. Even if it'd just been a single word instead of a few sentences worth.