You've probably heard about-and probably tried-using a banana as a handy, natural wanking sleeve. It's fun and it works really well, although I find that the banana skin has a tendency to split apart. But here's another great natural masturbation sleeve: plantain. A plantain looks like a banana but it's a lot tougher, and it can be a lot bigger (which is helpful for 'bigger' guys). Plantain is used in Caribbean cooking a lot so, if you don't find it at your local market, you should look for it in a food shop that caters to people with Caribbean tastes.
Buy a plantain that you think will fit the size of your penis. Bring it home, cut of the end with the stem, and scoop out the interior with a spoon. The skin is much stronger than a banana's, but be careful not to split it as you do this. (If you do split the skin, wrap the plantain with tape where the break occurred.) You may need a long-handled spoon if you bought a long plantain. Punch a small hole towards the end opposite the opening-unless you like a lot of suction, that is. Then, add plenty of lubrication to the inside of the hollowed-out plantain, give your penis an erection, and place it inside. Start moving that plantain over your penis. It will feel wonderful. Take your time and have a blast.