Yeah, be less possessive of girlfriends. That's a good general guideline. It's a small step from being overly possessive to throwing a punch. Don't go down that road. It's her body, she can masturbate if she wants to, however she wants to.
But to answer your question, it could easily be that she was more turned on by whatever you were doing. It could also be that you were inserting your fingers too early in the foreplay before and now you're demonstrating some patience.
Actually, it's most likely that she's getting stretched out from my massive cock, but that's another thread altogether.
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