Figure I'll also suggest one, while there's still time.
Characters are from Fate/stay night.
Rin Tohsaka naked, about a half an inch tall or smaller and still shrinking. She has a blank look in her eyes and is making an ahegao face while she violently fingers herself on Saber's stomach who is also naked, about 12 inches tall and pleasuring herself with a pencil.
Also Both Rin and Saber's hair attire shrink with them.
Rin Tohsaka
http://www.cosplayhouse.com/images/P...g_ver_01-2.jpg
Saber
http://www.downloadost.com/ost/big-f...-saber-ost.jpg