The largest I know of is Twenty :) http://blog.onahole.eu/age-series-twenty.html

Putting balls inside ? that points me to "Mr Balls Sucker", but that one is a bit smaller (6.7 inch). https://en-nls.com/pict1-39953

Both are stretchy though, so no problem poking at the bottom. Twenty's a bit flabby, it needs holding with both hands or else it "wobbles" around when stroking, pretty fun :D

>>363
Thank you very much, the first one definitely looks promising.