I know this is the opposite of what was asked but here it goes. While I was giving my fiance (now my ex) a blow job, while one hand was on his manhood, my other hand was tickling him in a certain area and he would laugh hysterically!
My wife has gotten off while I licked her soles and tickled them and she has done the same to me. That is pretty addicitve actually. Havn't gotten while tickling or being tickled though - sounds worth a try!