1) Latex Gloves, make sure you cut tiny air holes on 1 or 2 of the finger tips. I like to use like 2-3 inside of one another to take the edge off the texture of the towel
Knobby/Wooly Worm Toy, found one in a local store as it's meant as an office toy.. but If you cut a opening on one side and a small air hole on the other then flip it inside house.. you've got a masturbation sleeve.
3) Exercise Bands
Take your Glover or Sleeve and add lube, use a light weight exercise band, like in the 3-8LB range, wrap the exercise band around your Glove/Sleeve in a close spiral. Then fold your towel in half 1-2 times length wise, and roll up your Banded Sleeve in the towel making it tight.. but not too tight that you can't fit, if your using a glove try n fold the opening of the glove over the towel once wrapped to keep it in place. Put the thing between a mattress and throw on a Porno n have fun :D
The whole thing here is that the exercise bands will kinda act like a muscle tightening the glove/worm around you as you go in.