Mercy and Mason
Mason had adopted Stiles shortly after the young man had arrived in town. He loved that kid like his own son, and that didn't slack off any just because Stiles' actual dad had showed up in town. Instead, Mason had invited the man to move in, and he had more or less adopted Stilinski as a brother.
What that meant was what Mason was fully aware of the werewolves and had mingled with them on occasion. He had heard many a story about the feasts on display when the Pack hosted a meal, and Mason decided it was about time he checked it out for himself.
Seeing Mercy sitting by herself, he wandered over. He walked with a slight limp, especially when it was cold out, and he seemed relieved to sit down. "Tom Mason," he said. "I don't think we've met." But after two and a half years in town, he couldn't be expected to remember everyone he had met, could he?