Ok, so I tried it some more. I tried it on it's own and although I didn't want to buck Dallas away, I kinda felt weird and wanted to move on to other things (re: things I actually like).
But then, Dallas came home (at 5 am!) this morning after a night with the boys during which I'd sent him a bunch of pictures of me with my Lelo and we kind of went at it all crazy like. Him: drunk. Me: feeling liberated and awesome.
So, he played with the ol' butt hole quite a bit while he actually fucked me and I liked that. I liked that a lot.
So, I think we may have a convert here. I'll continue to keep you posted.