You're frozen with fear, and yet at the same time consumed by lust.  Utterly entranced by the creature before you, your heart races as your arousal continues to grow.  You want to run but your legs won't cooperate.  Something is happening!!  You can feel your body shrinking.  Truly this beautiful being before you doesn't plan on eating you whole?  Here you thought you were about to get laid.  Now you'll be lucky to get out with your life.