Burning sensation

Hello. I bought aneros helix trident recently and had a few sessions with it. I noticed slight burning sensation when the largest part would go through my sphincter. Last night it was really bad it made me feel like I had a diarrhea.
I do have aneros eupho syn and use liquid silk lube. Never had this problem before. Any ideas what could be causing it? It seems it’s just too big for me

Made a great progress last night – I believe there are 2 important factors to this

I bought aneros eupho couple of months ago and played around. Had some pleasurable feeling but nothing major. Last night I had what I believe a clear pathway to a super O, so I thought I’d share what I learned and what worked well. There are 2 factors which helped me.

First – lately I realized I could separate muscle groups while doing kegel exercises. There are 2 major groups – muscles near the anus and muscles surounding base of the penis. That’s the one I started focusing on. I learned to only activate that part of muscles. It feels like pulling muscles down (direction from penis base to anus) while activating anus muscles feels like you pull in. I lay on my back, pillow under the butt and legs bent and feet close to the butt.

Second – I didn’t ejaculate for 5 days. I always felt my progress was stalled because I was always ejaculating and was not horny enough. I think going longer without ejaculation helps to feel sexual energy and easier to recognize good sensations.

So last night I wasn’t particularly horny but I thought I’d still do a session. I laid on my back and started doing exercise I mentioned above. Very quickly I felt gradual pleasure in prostate region and it became very good after a while. Made me breathe more actively. Then it subsided a bit and for the first time involuntaries started which felt like beginnings of orgasm. The whole session was the best I ever had and I think I am very close to a super O.

Can anyone explain my experience please?

I’ve been using eupho for a couple of months now. Didn’t have any major breakthrough, just enjoyed the sensations.
Yesterday I had a session and wanted to enhance the experience so I puffed some 420.
It didn’t really do anything significant, so I decided to jerk off slowly. When orgasm came I clenched my pc muscles automatically but couldn’t release them. I felt strong pressure on my prostate (it felt like electricity was hitting it constantly). I had a strongest orgasm I ever had. It probably lasted twice as long and I also lost control of myself I moaned loudly and moved a lot.
It seems it was something close to what I read about super orgasms, except it was with ejaculation.