I mocked this one myself at the HMS STFU some time ago; I really, really wish I could remember how I found it. The sad bit is that it's not badly written at all: while it's entirely about a BDSM ageplay scene between Snape and Dumbledore, the spelling and grammar are impeccable.



Setting: DUMBLEDORE'S office.

Dumbledore: Come on, where's Snape?

Snape: (enters and is generally graceful)

D.: Okay, I'm waiting.

Snape: Right. (Removes cloak: "Severus was clad in a tight corset, bright red with black ribbing, and black suspender stockings,
of which were clipped with laced suspenders. His crotch was covered with a thin black g-string, which revealed the contours of his loins
very prominently. Upon his feet were black shiny high heels, and his fingernails had been painted bright red.") Take off your clothes.

D.: (Disrobes: "Dumble was clad in nothing but a large, white terry towel diaper around his crotch that had been pinned
together with two large safety pins. Around his neck hanged a blue plastic chain with a pacifier attached to it.")

Snape: On your knees, and come to Daddy.

D.: (puts pacifier in mouth; crawls to SNAPE) "I been a bad boy, daddy. I been a bad boy."

Snape: I'm going to spank you, then! (SNAPE proceeds to pull down the diaper and begin.)

D.: "Oh, daddy! Harder!"

Snape: Who am I?

D.: "Daddy!" (They finally end; SNAPE walks around and takes DUMBLEDORE'S glasses.)

Snape: (Quietly) "I hope you haven't got a dirty nappy for your daddy."

D.: I did a poo poo, Daddy.

Snape: On your back, then. (The AUTHOR proceeds to describe in great detail DUMBLEDORE'S aged and naked body.) I think you need another spanking.

D.: Me too! (More spanking ensues with a paddle and a bamboo cane; SNAPE makes DUMBLEDORE
beg loudly for him to stop. At last DUMBLEDORE climaxes; they rest for a moment, and then DUMBLEDORE is himself again.) My glasses, please, Severus. I'll tidy up, don't worry.

Snape: All right. (Leaves.)

At least both participants were consenting adults.