Twilight Sparkle gives herself a second head to be a better scientist. Double the brainpower won’t hurt, she thought. But when she looked at her other self being so passionate about her work she couldn’t help but be extremely aroused.
“Am I always this maniacal in the middle of an experiment? Am I always like this? Looking at it from the side makes me feel a bit disturbed… and aroused”. Let’s hope Twilight 2 feels the same. :P