Is it normal for your friend to give you hickies?

We're both girls by the way...So my friend, i think she's experimenting, cause she always tells people she is a lesbian or "this is my girlfriend back off" jokingly. Lol any way, in class we do normal stuff girls would do like: drawing on our hands, braiding hair, talking. But out of no where, she came from behind me and sucked on my neck! :o This was in the back of the class, so only our group of friends were laughing at what was going on. If you read my other post youll understand why Im the girl females want to expirement on. After a minute, looking at the results and how huge it was she did it again on the other side of my neck. "Wow you didn't try to stop her?" No cause once she started i just laughed it off. The next day though, she admitted if she were bi then she would go out with me. I'm just wondering if this is normal, cause telling people i got hick-a-fied by a girl makes people get suspiscious!!