I love both, anon! Rather than the shape of a bottom, I’m more interested in the spankee’s reactions and how they take their spanking. It’s the interaction that gets me going, the sounds they make, the little movements, the tears, their general bearing. Now, objectively, a nice wobble and bounce is very satisfying of course, but even the most conventionally considered perfect bottom has nothing going for it if the spankee is not responsive enough or if they’re too and disproportionately responsive that it becomes annoying. So yeah, the right mix of reactions is what does it for me, the chemistry in this beautiful intricate dance, not the shape of their ass