Zac takes this as an invitation to kiss you. His lip meet yours and you can't help but kiss back. You just lie there for a few moments, lip locked, and then he starts clawing at your clothes. You have a feeling that this is what Isaac was trying to warn you about.
Is this going a little too fast for you? Maybe you should stop right now before this goes too far. On the other hand he is a really good kisser, it might be kinda fun to continue.