WARNING: BLUE PLATE VARIANT IS UNSTABLE.
The default 1 on 1 pile-driver rimming is at my usual level of stability though.
The blue plate variant can work, but given the limited training data I could find, and the nature of the the concept (3 people all touching, one of which is upside-down), this is definitely a good torture test for my LoRA training method. Frankly it's a small miracle it works at all. Negative prompts of "fused limbs, bad limbs, bad feet, backwards head" are all highly recommended if you don't want a high chance of eldritch horrors. Using the Whole list of tags is also strongly recommended, more so than usual.
Flip him upside-down for better access. This LoRA helps with a pose where the male is getting rimmed in the pile-driver position, with his head down and legs up. While not necessarily being a size difference position, having the one rimming be taller usually makes the pose less awkward and is what most of the training data was. It also is capable of doing a blue plate special in the same position (where one person is getting rimmed and receiving oral sex at the same time) with an extra activator. The main Activator is p1l3dr1v3r_r1mm1ng, with the blue plate special variant being p1l3dr1v3r_blu3pl473, although using the suggested alternate weights is pretty important on this one. The issue is that the 1 on 1 rimming tag helps get the boy's position right and is still helpful for the blue plate variant, but it also fights with there being a second girl. Strength of 1 works best for me.