Vessel? So was she like some kind of angel too? Cole's brow furrowed for a moment as he considered that for a moment before realising that Cas had mentioned something a while back about a demon and then it became a little clearer. Oh. Right. A demon hitting on an angel. Now that was amusing! And probably way against the 'rules' or something, if such things existed.
"Would you get in some kind of trouble if you 'fraternised' with her?" Grinning in an overly cheeky manner, which he really couldn't help because of the classic double entendre. "I mean, she seems more... 'Ooh, pretty colours!' than 'Muahaha! I am Princess Stabbity! Stab, kill, kill!' You know what I mean?" That quote definitely had the tattoo artist looking up at him with a raised brow and Cole merely smirked and shrugged at her before turning his attention back to Cas.
"She can't be all bad, is what I'm going for." But did that make any difference? That he didn't know.