Hmm... I had girlfiends about 7 years younger than I so I can't say I'd condemn Harry. But why would she need 3rd eye drug? She literally has a 3rd eye.
And I don't think that "Evil" Harry will be _that_ evil. It's Harry. Goofy, shy, supernuker... but still Harry. Maybe with a few dings more. Maybe a bit more unscrupulous, because he knows the price for when situations don't get solved.