"Here Jo is looking at the Newton's Cradle.
It's stood on the back of the conjoined lower halves of a pair of twins -- I'm looking off-camera to their conjoined upper halves.
To find the text of the story, just put "bowling night" and "newton's cradle" into your favourite search engine.
There are eight images in all:
Jo gets a prize, The twins drink their coffee, Newton's cradle (uncensored), Jo divided, This arm is getting lighter, losing her waist, unzipping the shorts, and the bowling lesson."

Douglas' LiveJournal