Bubbly Bum LoRA
The initial weight is 3.0, but from the tests I tried, go wild. It starts to make the waists extremely small at 5+, and it becomes extremely unrealistic by weight 7.0. But you can do some tests to see what works, and even try to remove the waist bias with a waist slider or something like that. You're free to use the workflow in the images, as I found that a second pass without the LoRA tends to make better images. The two photos were made only with Krea 2 Turbo b16 with 3 passes and this LoRA on the first 2.
The 750 step version is the better, more agressive one, that I used on both example images. You can also get the 1500 step, it's not as strong, but can also generate some nice outputs.

