I have so many. hehehee
My favorite is a TENS unit.
While doing my chores I it on under my clothes. I have the cables from the pads to the TENS unit threaded thru my pocket. No one can see it.
For some pleasure. The base of the penis on topside, and the very tip can feel pretty good. Of course after 5 to 10 mins it can feel too good and keeps edging and deny an orgasm.
While I do chores if it takes me longer than my Virtual Mistress allows (my wife controls my VM) then I have to increase the level and it begins to become very uncomfortable. Also putting pads on different parts of penis and even the balls will vary the pleasure and pain.
I really also love a dog shock collar on my cock or balls. At first this really hurts but I find the cheaper collars don't keep such a good charge after a while. When my wife has time I am lucky enouhg to have her inspect my chores when I am done. If and when I do not do a perfect jump she zaps me. Some times she zaps me the entire time I am making the correction... pretty hot.
Trying to take out the garabage while you feel like you are going thru mini orgasms and trying not the nieghbors to notice is pretty kinky.
I have a few variations that are more painful... I don't really like those so much but let's be honest, when a good sub fails to preform this is necessary.
http://www.amazon.com/gp/product/B00DCEBLP4/