"My sister. You will impregnate her."
Jane was stunned. "Wait, you have a sister?"
"Of course. My sister is the strongest warrior in our tribe. I promised her a great prize for her achievement."
"My cock?"
The princess nodded. She motioned to the entrance as another orc entered. Jane figured she had to at least be in her early twenties, so she was probably the princess's sister. Like all the other orcs, she had a well-toned body with pale green skin and sharp tusks. Her hair was the same brilliant red as her sister's, but half of her head was shaved. She had a skin around her waist and some chest armor, but otherwise she was completely naked.
She and the princess had a brief conversation in the orc language, which Jane couldn't follow. But based on what was said, she implied that the talk went something like this:
"So this is the Chosen One?"
"Yes, sister. Like I promised."
"She's scrawny. Weak. And human."
"Well, take a look for yourself."
Suddenly, Jane's pants were ripped clean off her body, exposing her penis. The orc bent down and felt it with her hand. Jane felt herself getting hard, which pleased the orc.
"We will mate now, Chosen One."
Jane knew nothing about how to use her cock, so at first it felt very uncomfortable when she had to insert it into the orc's vagina. But once she started moving, it didn't matter. Riding on top (for the orc would have crushed her otherwise), Jane slowly built up a rhythm, moving in and out until she felt herself cum and release her semen into the orc.
"Not finished, Chosen One. Again."
Jane complied, but cumming twice tired her out. "I'm done."
The princess wandered over. "I'm disappointed, Chosen One. You have no stamina."
"What did you expect? I've never done this before. Now are you going to uphold your end of the bargain?"
"Not yet. My sister is not finished."
"But I'm done..."
"Drink this. It will help."
The princess offered her a goblet with some sort of steaming liquid inside. Jane was reluctant to take it until she heard growling underneath her. The orc was impatient. Jane just swallowed her concerns and drank what was offered.
To her surprise, the potion or elixir or whatever it was removed every trace of fatigue and made her feel as if the past hour had never happened. Her balls felt full of seed. The orc grunted, and Jane resumed fucking her. She was so absorbed in the pleasure that she didn't even notice her pale skin starting to turn a shade of pale green. Or how her skinny arms were starting to increase in size and muscle mass. Or how her canines were protruding out from her lips, getting thicker and sharper until she had a set of fine tusks.
Jane didn't notice until the changes were complete that she was now a tall, buff orc woman. The realization hit her just as she felt herself getting ready to cum a third time. Pulling out, her cock exploded and covered the orc warrior's face with semen as Jane herself let out a primal roar. She rushed at the orc princess, grabbing her by the throat and holding her aloft.
"What the hell did you do to me?"
"Made you one of us. Now, you can never leave." She struck Jane on her pointed ears with the palms of her hands, causing the orc to release her grip and letting the warrior grab her from behind and lock an arm around her throat.
"Chosen One, you will stay here as one of my sisters. You will live with me and have every need attended to. Of course, you will also be trained to fight. And..."
She grabbed the curtain at the entrance and folded it back. A line of orcs stood in an orderly formation, barely hiding their lust.
"You will...