This turned out far better than I expected. I was anticipating a whole lot of fused limbs and general mangling, but it actually works kinda consistently.
Very flexible weight between 0.3-1. Supports all gender combinations but is Bias toward male/female kissy faces.
Positive prompt you should have "2 people kiss under mistletoe", and/or "mistletoe hanging from ceiling".
Putting the genders you want in the positive and negative prompts helps ensure you get the genders you want.
Works with other Loras, but will alter them to be more "festive"