I was a little shocked when mine ask for it, but I soon discovered that what spinach did for Popeye, pee does for Jake.
I get a real kick out of holding a guy's cock as he pees. First time was in high school, and have held many guys cocks as they pee. Especially fun - using the pee stream to try to "write" something - usually not more than a letter or two, but fun! Definitely something I can't do. Also - with me holding and aiming his cock, it usually grows and needs further attention .....