I found that the Handy Gen 2 sleeve to be great if I’m expecting an video or more likely a game to have some slow points. If I want a Onahole that can do similar even if I use my oil like INSOMNIA lube then it’s Virgin Matchless.
These do provide the suction you said about which is key but also what is just as key is having the SR6’s limits set correctly as I recently got back to using mine after a bit of an break and while the Gen 2 was fine, the Virgin Matchless I had a few slips when hard as I had I had roll and pitch set to random generation and it just went wrong at the top of the script. (even after disabling surge and sway from copying)
It’s difficult to get onaholes which aren’t lifelike to a degree and so have an entrance that is more like a cock ring, causing said suction. (while also not being tight enough inside to push you out)
I also constantly forget that the entrance area can result in you sticking out of a onahole since some are made to have the entrance indented due to the side thighs/ass cheeks which I know that I can fill the tunnel length if they weren’t in the way. Flat entrances just seem rare.