Ok, so, I'm looking to use this toy anally, mostly for use with my friend who has a new Aslan leather harness.

I'm not new or shy to anal, I'm probably going to get the large, which is a quite a bit wider and longer than my current warm up toy. And I want this one to be my replacement for it. Since I'm trying to scale up to bigger sizes/fisting/Chance (one day, etc.)

Since it'll be for more causal use, I want it to perform well if my partner puts me in an abnormal or improvised position. I don't want them to have to hold onto it (within reason) to give it more support, to prevent it from coming out of me of I/they are at an odd angle. And I want to be able to push it inside me with one hand with reasonable ease.

I had a sample pack at one point but have since misplaced it. I am pretty sure I don't want firm, I think it would be too unyielding. But I don't know if I want to do any sort of split (firm base, mid shaft)(med base, soft shaft), or just all medium.

(Ideally I think if the first third could be firm and the rest med or soft all the way to the base, would be perfect, but I understand that's not how they're molds work.)

For reference this is my current "standard" https://youtu.be/Kxf7IX0ZXjU (I don't think it's body safe so that's one of several reasons for the upgrade).

I have also used crystal jellies of similar and slightly larger diameter up to 12", but haven't been able to comfortably do that in a while, I think 9-10 is my comfortable upper limit on most days (Which is why I want to explore larger widths now). I also use NJoy's largest pure plug (not the pure plug 2.0). Just for some references if you are familiar with any of those, then you'll mostly understand (I hope) what sort of criteria I'm trying to fill.

I really, REALLY appreciate any and all help, advice or suggestions. I am very excited to join the club!

EDITED TO ADD (the actual questions):

Based off the info, what density might you guys recommend? Should I go with a split density? (Especially regarding use in odd positions)

And then also. Any thoughts on if I should go with the large? Or should I think about just getting the medium?