Am I A Cuckold Now?: How My Girlfriend Lost Her Innocence

As a geeky, skinny, and ineffectual guy, I'm surprised when a friend becomes a romantic interest. Her sense of purity is strong, but her naivety seems to be her downfall when we go on a vacation with friends she works with... all large buff men! One of them, Stan, has his eyes set on her and goes so far as to tell me to my face that he plans on banging her before the trip is over. The rest of our vacation is spent with him manipulating her and us fighting over his advances... assured that her piety is important to her, I only want to protect her, but when I find that she's falling into his trap, I'm left wondering if I'm about to become a cuckold.