The first option the Veiled Lady gives Theodore resembles marriage. Only once they’ve sealed themselves together with a consensual kiss will he be able to remove her veil and truly know her. This will bring him lasting happiness. Still, she can’t stop him from forcibly removing her veil, which resembles rape. If he does this, however, he will be haunted by the act (she’ll be his “evil fate”) and by the knowledge that he’ll never get to know her the way he would if he had done the right thing by gaining her consent through a kiss. That kiss must be done while she’s still under the veil, or still in a state of innocence.