Cock sleeve for getting her wanting bigger?

I tried one but there wasn't much feeling for me and I had trouble keeping it up. maybe I don't have the right one.
Any suggestions?
I’ve tried quite a few cock sleeves, and then some really nice big dildos and just worked her way up. She loves being stretched out now. Her favorite is two cocks at once in her pussy luckily for me. I get to clean that mess up.
 
I’m looking at possibly picking up a penis sleeve to see about training my wife’s pussy for bigger dick. Curious of anyone else has tried this and if it worked?

She doesn’t complain about my size (6” and decent thickness) but I’ve noticed she’s not as tight on me as she used to be
My MISTRESS will have me wear a hollow strapon 9" x 7"if she wants cock and doesn't have a BULL