I stumbled across this one back in my early teen years, during a period when I'd put my penis on anything to see if it felt good, and sometimes I'd try things two or three times just to make sure I hadn't missed anything the first time. In this case, all you need is a mid-size plastic bag of cotton balls, like what you can get at just about any drug store. Put a hole in one end, insert your penis, hold the bag with one or both hands, and go to town. The sensation is surprisingly soft and warm and enjoyable.