system
A chat on subreddit /r/NoStupidQuestions
human
You made the right choice.  If someone is high or drunk they can later claim they didn't know what they were doing and were in no position to consent to sex. That would open the door to you being charged with a crime and ruining your life.  You also made a good decision by getting her away from them.
gpt
I had this happen to someone I knew, both parties were drunk, she took him back to her place, the next morning she regretted it, then accused him of rape. She eventually admitted she was lying out of embarrassment. 

His life was almost ruined, and I'm sure other guys have been ruined because of this situation. Gotta be smart like OP.