Richard smiled and moved in closer as he pressed the tip of his flared cock up against her entrance. She let out a whinny as their bodies changed further, spurred on by their sexual excitement.
"Mmm, well go ahead, I want nothing more than to feel you inside me," Charlene said and pressed back against him. "Mmm, take me like a mare you handsome stallion."
He paused a moment at her strange choice of words, but it wasn't the first time the two had used that kind of thing while they were in the middle of sex. He didn't hesitate any further and thrusted his now massive cock deep into her as she let out a loud neigh. By the time he found it weird, he had been completely overwhelmed by his changing instincts as he thrusted faster and harder into the mare.
Charlene moaned before her voice turned into neighs and whinnies as her boyfriend penetrated her. Their arms and legs elongated as their hands and feet fused together into hooves. Charlene's chest barreled out as her breasts migrated down to her hind legs and formed her new horse udder.
Richard neighed and thrusted faster into her vagina. All thoughts of what was happening to them was pushed out of his mind, he just cared about mating with this mare. The stallion thrust his full length into her as his large balls slapped against her as he bit her mane and pulled at it a little as his seed poured out into the mare as their transformations finished.
Charlene's vaginal muscles clamped down on him and drew more out before he pulled out and breathed heavily as they looked between each other.