heres my pick,not sure if shes an alien but Mystique from x-men is still fine.

also on a weirder note: how about the deadly spider-like woman on the Wicked City anime...she even shoots web goo from her groin area to catch her prey.and she can descend like a spider with the attached web pertruding from her pussy.
although i wouldnt wanna be killled by her like the guys in the anime,id just want to be trapped in her clutches and have some danger sex with her.thats all.
would you or wouldnt you lick that out?

on her back

the lucky/unlucky guy caught in her webjizz
