Bottle continued.
Once I'm touching the floor, the bottle is deeply enough embedded in me that I can raise myself a bit, slip a hand under its base, and stand up. That is quite a sensation! Then I can carefully work it further into me until my anus begins to close a bit over the base. By this point, the bottle can be felt with its cap above my navel. Now comes the tricky bit. I should explain that a PET bottle, well capped and totally filled with water, is incompressible and quite stable under load, but can change shape as it progresses into me to accommodate any pelvic bones impeding it.
The bottle is by then almost wedged into me, the cap pressing my spine from inside. But if I lean backwards, keeping my hips level, the vertebra that's in the way moves back a bit and I can work the bottle further up my descending colon. Eventually it is forced right inside me by my own sphincters closing on the base - an incredible (and rather nervous) moment, very erotic. If you could see me then, you would be unaware that I have a rather large bottle totally inside me! And it feels immense, gorgeous - a moment of triumph! The cap, at this point, is located just behind my lower ribs. The first time I did this, I cautiously and at each new depth, tried expelling it by bearing down - just to be sure I could. Well, I could. From totally closed anus, the first push sent the bottle to where it was still trapped by my nearly fully-dilated anus, and the temptation to push it back in again was irresistible. It again sank in with a new thrill...!
Getting it right out is surprisingly easy. I do it standing up and bearing down hard, and the last bit comes out in a rush. Then I can re-lube both my areshole and the bottle, clamp my knees together, bear down hard on my already almost prolapsed anus, and in a single, highly erotic movement, push the bottle home again in one smooth thrust. Aaahh! Sometimes I will do this in the shower, and soap myself with the bottle fully enclosed before rinsing, drying myself and then expelling it while watching in the mirror behind the wash basin (= sink, US). The view of my hole stretching and stretching is also quite a turn on.
I found it isn't a good idea to do this with a full bowel, thought the bottle still goes in easily enough, because it does come out dirty, and moreover my anus does not immediately recover its ability to close properly. There can be, shall we say, fallout!
Johnny