Relayed from my tumblr post,
I 've made this comic after finding a most disturbingly hilarious GIF
spodiddly.tumblr.com/post/6063923336/spocks-tongue From that my headcanon was that Vulcans have elongated tongues during sexual arousing activites.
(Yes the comic is there also, but I wanted to post it here as well)
Excuse the style changes as well, for I became tired halfway through (it was 1 am)