I found a new position.

I've never been one for laying on my back for aneros sessions. I'm a left-side man, with knees crooked, for almost all my years using aneros, or aless sessions.
but a few days ago, by accident, after a disappointing session, I flipped over on my back, with right knee hollow (ie behind my knee) resting on my left knee, like knee-spooning.
It caused a very nice feeling in my prostate, that gave rise to many Os. plus I erected quite noticably. Many dry OS. It was quite delightful.
I encourage you to try it, if you're looking for something new.
Because it causes the thighs to be in close contact, it reminds me of my first sexual feelings as a boy, climbing ropes in gym class.