Finger in the butt 😳

The last time my fwb & I hooked up he put his thumb in my butt.. during doggy style he put a little bit in, without asking me and kinda just left it there.. he didn’t really move it or anything. And I couldn’t really feel it.. but now I’m wondering if those previous ‘accidents’ where he almost put it in my butt were really accidental.. we haven’t talked about what’s off limits but I think the fact that I moved it and said, “wrong hole” says a lot right.