Earlier quoted context omitted.
She agreed to the body shot and nothing else. There's no consent for other things. Body shot is not a 'gateway drug' to sexual assaults.
Consent is almost always just implied, not explicit. I'm in no way defending him or his actions, but it's understandable how an intoxicated guy (therefore less able to read subtle body language signals) could think an act of foreplay like licking alcohol from her body was a way of consenting to further sexual advances.
But when you kiss someone, and they fail to reciprocate, and certainly when someone tells you to stop, you've clearly crossed a line. In my mind, there's absolutely no room for grey area in this from the point she said "stop".