Strolling out of the library on her lunch break, Myfanwy's got something other than food on her mind. She's got the urge to be very wet and dirty, so she finds a quiet street, and wee in her panties. She's obviously been saving up her pee all day, so there are countless streams pouring every which way. Inspecting her puddle makes her feel sexy, and very, very bad - after all she's supposed to be a prim and proper librarian!