"A lovely mare needs a handsome stallion." Queen Beth grabbed the boy's penis and rubbed it again. He tried to twist away, but his bindings were too strong. To his shame, he pounded fully erect - and continued to swell.
As his sister conitnued the transformation into a glossy black mare, Palador looked down to see Queen Beth's hands caressing what was obviously becoming a black stallion's shaft, thickly veined and already forming a thick sheath at the base.
"No!" His strangled cry made Beth laugh.
"Oh, definately yes, my dear boy! What a fine pair of breeding animals you will be, creating a herd of intelligent black Shires for my Knights. Instead of brother and sister, you will be sire and dam."
Paladin felt tears in his eyes, but the nearly fully equine rear end of his sister was giving off a rich odor that his own enlarged nostrils drank in eagerly. "Please. Don't make me mount my sister."
Queen Beth laughed. "I won't make you do anything. Your new instincts will take care of that. But I will give you a choice. you can mount her and become a stallion, or suckle from her new teats and become her foal. A filly, doomed to grow up and join your sister making foals for me as a mare. If you choose that route, perhaps your brother will assume the role of stallion."