My Girl's stained panties

Pics of my Girlfriend's panties from this week, she says she hasn't fucked anyone else but this really looks like cum to me. Have posted in other threads but you girls know best. Love to imagine her getting filled with cum. Do you think this is cum? would love to hear ideas of what you think shes done, especially how you ended up with similar panties.. really appreciate replies x
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Does is really matter if it's "real" or not? Your imagination can be your best friend! Sometimes when my wife is gone, and I check out her panties, when they have extra secretions in them, I just fantasize that she's been a naughty girl with some big well endowed black man.