Cock sheath/penis sleeve? Any experience with these?

So I love the idea of orgasm control.. I’m assuming you are in the same boat if you are reading this.I’d like to try out sex with a sheath/ sleeve after applying numbing cream on myself.My main concern is that the sleeve/”extender” will be too girthy or too long for my gf. I really only want to add a slight bit more girth with very little length.I’m worried that just one condom over my numb member won’t be enough to dull my sensations. Two condoms seems like overkill. But a nice layer of silicone seems like a good solution.Does anyone know of or use a penis sheath that doesn’t add much length or girth that would still limit the sensation for me?Thanks in advance! Get your own Orgasm Control toys: For men: http://www.amzn.to/1V6XQvv For women: http://ift.tt/1UWn54n