The Island of Doctor Sex IV: Bred by the Rhino-men

Miss Gardner finally gets some proper rest, but she's woken by a trio of rhino-men who want to join in the breeding experiment. After they all take her at the same time, two of them put on a display she won't soon forget. And then the doctor decides he doesn't want to stay on the sidelines after all... This short story is roughly 3,700 words long and is not intended for readers under the age of 18