ThanksAny toy with a subtle knot should do the trick. I haven't been able to do it but I've gotten close a few times with toys like Roland and Nova, both from Bad Dragon.
As for sizing just get a medium in medium firmness, and invest in a suction cup, you'll appreciate it a lot.
Amazon has some decent stuff! I bought my first knotted toy from there and I got hooked. The things on there are pretty cheap too compared to other places.I’m a male 24 learning to cum hands free any toy recommendations for anal use?