"At least warn us", son... do you use your mind, ever? The warning is in front of your face, and it implies that the NTR is completely optional.
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You're the one living in a fantasy where all the girls are yours. But the reality is, your girlfriend is being fucked by someone else, so you're playing out a fantasy you'll never realize without a lot of money. So I recommend playing NTR, as it will save you from the trauma of your wife cheating on you.