Maria unbuttoned his trousers, calling his bluff. She knew her appearance was turning him on, and guessed that he wouldn't jeopardise his alone time with her by injecting her again.
The assistants cock sprang from his trousers, and Maria engulfed it hungrily.
"O-oh, w-wow" he stammered.
"Your mouth is s-so...spacious now, and your tongue...is so strong, so rough" he said, still trying to evaluate her changes.
"It fe-feels so much better than I tho--hnnngg" he stopped mid sentence, already blowing his load into Maria's throat. She swallowed it all, licking his cock clean, then slid her face off it.
She stood up, and was slightly taller than him. He actually seemed a little intimidated. Maria put a hand on his head, pushing him towards the ground. He knew what she was trying to get him to do, but he tried to regain his professionalism.
"These legs are...incredible. They look so genuine, and so strong." He admired, running his hands along them.
"It still feels so human, despite looking like it belongs on a horse... And those hooves are so solid..."
Maria couldn't wait for him anymore, grabbed the back of his head and pushed it between her legs, positioning herself above him. She didn't give him time to object as she ground herself against his mouth, noises of pleasure escaping her. She wasn't surprised he was good at this, with all that pointless chitchat he kept spouting.
She held his face there, giving him brief moments to grab some air before she pushed him back in, hips bucking faster as she got closer to her orgasm. Thirty seconds later and she whinnied loudly, stomping her hooves on the floor as she rode out the wave of pleasure.
His face emerged from her crotch, soaked in her enjoyment as he tried to get his breath back. Maria instantly climbed onto the bed, kneeling at the edge with her ass sticking up in the air. She wiggled it slowly from side to side, tail flowing around, as she tried to lure him in.
He didn't need any forcing this time, approaching her instantly, hands grabbing her hips.
"Your waist has widened so much, and that tail is amazing" he drooled as he rubbed his cock against the entrance to her pussy.
Maria moaned slightly as he did so, eagerly waiting for him to plunge into her. But first she felt a sensation at her asshole, as his thumb traced around it.
"I've never seen one so...prominent before..." He said to himself, then slid a finger in. Maria gasped, then pushed herself onto it, letting it penetrate her deeper.
The assistant then slid his cock inside her too, and she was instantly lost in the sensation of being double penetrated again, whinnying with each gentle thrust.
He gradually picked up the pace, forgetting about anaylising her and getting engulfed in the need to fill her with his cum. The pair got louder together, until they finished at the same time, satisfied they got what they wanted.
The assistant quickly composed himself, making himself decent again and tidying himself up. Maria laid on the bed blissfully, enjoying the feeling of his cum leaking out of her.
The awkward silence was broken by a sudden clap.
"Well then! Let's get you to your new location then shall we?" The scientist said. Neither of them had noticed him even come back into the room.