nanny cleans you up

You just enjoyed a day out at the beach with your nanny. Now it's time for me to clean you but you dont want to get into the shower! I tell you it's ok, I can give you a little sponge bath. I, of course, take off my bathing suit because I don't want it to get wet...I begin cleaning you and notice you have an erection. Why would I use a towel or sponge to clean you, when I could just use my mouth???