Karlach claims she cannot be touched, hugged, kissed...

[Linked Image from i.imgur.com]

(YOU'RE WITH HIM!)
[Linked Image from i.imgur.com]

In all seriousness though Larian missed an incredible opportunity here to show off some wonderful attention to detail by having Crusher's lips singed if the player plays as her during this scene, because after all it is somewhat lore/immersion breaking that he gets to do this freely, since not even Dammon at this point was able to come even remotely close to her.

Crusher is the MVP right now, we weren't even her first kiss! wyllcry