[Jack is warm and strong and soft where he needs to be. By the time they're done here it's not going to matter if it was the Mega Kissing Bot or one of the regular ones, is it? There may already be confetti as far as she knows. She isn't exactly stopping to check.
And as much as she would never want to jeopardize things with Reid or hurt Ianto—which is a lot in both cases—she's still here, still kissing. Oxygen is going to get the better of her than her conscience at this rate.]