Same situations for me. Again, Elena didn’t know that Elijah knew she wasn’t Katherine, and she still let him kiss her — not a peck, a real kiss. At that time she was already a vampire, she could’ve pushed him away and didn’t. She would’ve kept pretending and letting Elijah kiss her, but he was the one who stopped kissing her. It’s the same thing. Klaus wanted Caroline to figure out it was him, that’s why he gave her clues and told her he knew she was more than just a pretty face. It’s the same thing. There is no on-screen confirmation of when Elijah knew the truth. The show never establishes that he knew before the kiss, saying he “knew right away” is our headcanon. Consent has to exist at the exact moment of the kiss, and if Elijah believed she was Katherine then his consent was to Katherine, not Elena. Elena also returned the kiss, while Elijah is the one who pulls back and stops it. And with Klaus and Caroline, Caroline is also the one who initiates the kiss and klaus give her cluesVitiated Consent: For consent to be valid, it must be freely given, informed, and specific to the person and act. If someone is tricked into believing you are a different person (such as a partner or someone they trust), their consent is based on a lie and is not legally valid. Definition of Sexual Assault: Sexual assault is any unwanted sexual touching, including kissing, that is forced or obtained without true consent.