With your hands grabbing her lower back, it really doesn’t help your state of mind any. What would the other two think? You’ve already all but committed to Twilight, and Luna’s finding her way into your heart even through your mental objections from your prior culture’s monogamous leanings. ‘Sorry gals, I really want to fuck your sister/teacher. No hard feelings! Jus primae noctis? Oh it’s an ancient Earth custom, the ruler gets to bang your new spouse. Stallions are the fairer sex here, right? Just the way it is on this bitch of a world.’ Celestia might have it all, but you’re too terrified of breaking their hearts to let yourself even think of doing anything about it. So here she is asking you to.