Horse cock

You let your balls grow untill the each is the size of your first. Your already hard cock grows and morphs into a brown, two foot horse cock.

"Lift your tail!" you shout and Ella raises her brown, grey fluffy tail straight into the air exposing her dripping pussy and tight asshole. You approach and rub your thumb around the latter.

"Be a better girl and next time I'll do your pussy."

"Yes, Master." she whispers, so turned on she's barely able to speak. You grab your massive cock, your hand only able to reach halfway around, and shove it against her asshole. But it's too tight. No way you'll be able to get inside. You turn around and try to calm yourself down with Ella out of sight. Looking at her perfect ass still raised high above her head, you'd never be able to do so. The pulsing in your cock quiets and feel the tension relieving. You wait, eyes closed, until your cock is completely soft. Approaching Ella you ask: "Ready for your training?"

"Yes master!" she yelps.

You start to gently stuff your soft, meaty cock into Ella's pulsing asshole. Blood is already rushing into it as you do so. Once it's just the right level of hardness without being to big you push yourself fully inside and press your hips hard against her firm ass.

"Bark for me!" you command. Ella starts barking so loud it almost hurts your ears. Every time she does, her ass contracts against your ever growing dick.

"Who's a good girl?"

"I am!" Ella shouts between barks. As your cock grows inside her, Ella's asshole is stretched by your girth. Her barks become interrupted by yelps of pain and lust.

"Still enjoying yourself?" you ask with a smirk.

"Oh yes master. Having your giant horse cock inside me is sooo, soo good. Oh thank you master!"

"You'll never learn your lesson like this."

Your cock is now fully erect and halfway inside Ella. Before quickly shoving your remaining 12in inside her, you use your alteration powers to ensure Ella can handle all of you, no matter ass, pussy, or mouth. Your hands around the bottom of her waist, you pull Ella's ass fully against yourself.

"Aaah! Shiiit..." Ella yells.

She contracts slightly with every short, quick breath she takes. You feel this slightly massaging all 2ft of your cock.

"Bark!" you shout. Ella barks, increasing the contractions. Rarely have you been this turned on. You pull out, almost completely, and start to pump your cock in and out at full speed. With your hands still around her waist you feel her stomach expand and retract with every pump. Ella's barks gradually turn into wild, ecstatic moans.

"Oohh... oh... ye... ess!"

You grab her silky, brown hair and pull her up. Ella is now kneeling in front of you, back arched. As you place your left hand on her stomach you now clearly feel your cock moving in and out. You move your other hand from her hair to her mouth. Ella greets it by slobbering it with her tongue, which entirely covers your hand. You can't hold out for much longer...

"Ready for your treat?" you ask. Ella moans agreeably. Both hands on her stomach you shove your horse cock inside entirely inside her one last time. To your surprise, as you push inside, the head of your dick expands. In the next moment a wave of ecstasy flows from your head through your body. You feel a jet of warm cum shoot out of the widened tip of your cock. You close your eyes as burst after burst of cum drains from your balls. You cum for 30 seconds straight, filling Ella with a mass of cum. You slowly pull yourself out. A stream of cum follows your cock out of Ella's stretched and twitching asshole. She lowers her head to the floor and breathes deeply. Her ass raised into the air cum is still dripping out and into the small puddle forming between her legs.

"Did I do good?" Ella asks timidly.