Lindsey would've argued that playing to his roughneck with good ol' boy charm role wasn't the same as flirting, but that would've meant admitting the ruse and showing more of himself.
The flash of pain as her fangs pierced his wrist was ignorable, nothing compared to some things he had endured, and he could feel his heartbeat rise slightly in response to the pain and the draw of blood. The black eyed, veiny face had taken some getting used to, different from the vamp-face Lindsey knew of from his world, but at this point it was as normal as Lindsey not showing any fear. He could handle himself if Caroline got out of control, better than some she could feed on here, and she didn't have to wipe his memory afterwards.
Re: For Lindsey
The flash of pain as her fangs pierced his wrist was ignorable, nothing compared to some things he had endured, and he could feel his heartbeat rise slightly in response to the pain and the draw of blood. The black eyed, veiny face had taken some getting used to, different from the vamp-face Lindsey knew of from his world, but at this point it was as normal as Lindsey not showing any fear. He could handle himself if Caroline got out of control, better than some she could feed on here, and she didn't have to wipe his memory afterwards.