Yes, it happens and to a lot more girls than you might think. Some of them just get sooo pissed off for a guy cheating them or something that they go lesbain, others, like this hot little twat do it fro help in school. She had a BF but needed help from a girl in class and that girl was hot for pussy so they had a trade off.
Personally I busted a nut watching the video that the girl shot of the little girlfriend. She got some pussy and we got to see the action. Check it out now!