Stein smiled sadistically as he loomed over the cage holding his latest specimen; a Siamese cat. Yes he had dissected many cats before but he just wanted to cut something open so badly or at least do some form of experiment. He was hoping to cut this one open and observe its intestines today…yes he could go for taking a look at a digestive system today.

Smirking greatly, he pulled out the cat from its cage. The moment he touched it and pressed down on its stomach, it made a variety of mews, whines, and other loud vocal sounds. Stein raised a brow; the cat hadn't been this vocal before. Setting it down on a table, he reached for a syringe full of sedative…yes and then he would administer some anesthetic. However, he was quite surprised at what happened next after he took a closer look at his specimen.

She was continually mewing, her stomach was bloated, and she stuck her rear in the air. Then Stein got it…damn, she was not fit for experimentation; her insides would be too hard to observe as one of her organs would be highly bloated. She was in heat.

Agh! What now? He had to experiment on something! What? What could he do now…

Ah…what if he— no…he couldn't. He simply couldn't; it would be…unethical maybe? Hmmm but he was curious…so very curious. So curious…ugh he couldn't stand it! It was raking at his brain! That was it; wrong or not he had to pursue this new experiment. He had NEVER conducted this one before.

I've never done any special type of experiment on Marie before. This experiment shouldn't harm her…hmmm it might make her feel a bit odd, but it won't hurt her. I'm sorry Marie, but I have to know if the outcome of this experiment.

Stein smirked as he held the cat carefully and placed it back into its cage. "I'll save you for later…" he said softly as he snatched up a few things from his lab and made his way upstairs to Marie's room.

It was midnight and as he quietly crept into her room, he was happy to see she was sleeping.

"Perfect…." He breathed as he got to work. "My Marie; completely unsuspecting…"

XxXxXxXxXxXxXxXxXxXxXxXxXxXxX

The next day, Stein eagerly awaited Marie downstairs. He wondered how she would behave today…those shots he administered should heighten her hormone levels dramatically.

And like clockwork, Marie came walking downstairs.

"Good morning Marie." Stein greeted causally. Marie simply groaned in response as she made her way over to the pantry and pulled three bars of chocolate from the top shelf, and then took some chocolate milk from the fridge; groaning once again, she plopped down on the couch and rolled on her side.

Stein observed her closely…ah then he noticed her apparel. She was wearing a very thin white camisole along with some very short sky blue sleep shorts. Walking over he suppressed a grin as he noted the change in her complexion. Her cheeks, tops of her breasts, and even her thighs were a dull reddish-pink. He dared to say that his experiment was going as planned so far.

"How are you feeling Marie? You seem a bit different today." Stein said causally.

"Nnnn I don't know…" she whined, rolling onto her other side. "I feel hot…" she complained.

Mmmm yes she WAS quite hot…no he had to be professional right now.

"I'm sore…" she continued.

"Sore where?" he asked, cocking his head to the side.

Marie's cheeks hued even more. "I-I can't say exactly…"

Stein suppressed yet another smirk; just as he thought…

He watched as Marie shifted about uncomfortably, moaned and whined, and tugged at her clothing in discomfort.

"Is there anything I can do that might help?" Stein asked, now smiling.

"Nnnnnnmmmm no, I don't think so. I'm going to go lie down upstairs again." She said, standing up shakily.

No; stay here damnit. Stein thought.

He watched her walk away, her slender, shapely legs rather wobbly. Yes…he believed that she was indeed in a sort of "human heat."

He had to observe…somehow. And so he followed ever so slowly and peered into her room. Good; she was in the restroom. Taking his small window of opportunity, Stein hid himself in her closet, leaving just enough of an opening to see her bed. Just in time too, as she made her way out of the bathroom and began to…strip herself into her undergarments.

Rather begrudgingly, Stein decided to preserve her innocence and respect her; after all he should keep this semi-professional. So he closed his eyes until he heard the creaking of her bed along with the rustle of bedding; he finally opened his eyes, revealing a VERY uncomfortable Marie. Like before, she trashed about uncomfortably but soon developed a new symptom; panting. She finally, rather hastily flung off the covers and lay on top of them. Stein decided that for observation purposes, he was going to have to.

However, the next symptom tested his professionalism as she began to rub her thighs together, slowly at first but then rather roughly later as she moaned again. Stein gulped and soon began to regret (at least to some extent) that he had come in to observe as he watched Marie push her hips upward into the air and hold them there.

"Oohhnnn wh-why is this happening?" she panted.

She rolled over onto her stomach and much to Stein's surprise she began to rub her hips against the mattress.

"Ahnnn it…it won't stop…" she whined.

Won't stop? Ahhh perhaps she was seeking some form of relief. Knowing what would relieve her; Stein couldn't help but have some desire to satisfy her body's craving. He felt a sudden wave of guilt wash over him; this was wrong…

"What's wrong with me? This is…horrible…it almost hurts…" she whimpered as a few tears sprung up in the corners of her eye.

Stein felt bad…sincerely bad as full regret filled him. He had successfully put her into a heat, but he had only wished to tease her senses a bit; not put her into this type of pain.

Then he saw her make a sound of frustration as she stomped off to the restroom once again. Stein took his opportunity to leave the room.

Ugh…what had he done? He felt more like a disgusting pervert than a scientist…

XxXxXxXxXxXxXxXxXxXxXxXxX

The next day Stein was relieved to see that Marie was back to normal; good thing the affects didn't last long.

"Are you feeling better today?" Stein asked.

"Yes; I'm back to my old self!" Marie said happily. "Ugh, I don't know WHAT was wrong with me yesterday!"

Stein frowned; he should tell her….oh boy…he was going to get his ass kicked for this…

"Marie, I need to tell you something." Stein said.

"Hmm? What is it, Stein? Are you alright?" she asked with concern.

"Yes but…I want to apologize to you. You see, you were an unsuspecting subject in a recent experiment of mine." Stein said, glancing off to the side.

When he turned back, he saw Marie's eye widened. "Did you…take any organs out of me?" she said shakily.

"No, but…the way you felt yesterday was my fault. An experiment of mine…I increased your hormone levels." Stein explained.

….

Marie didn't speak for a long time; finally Stein spoke up.

"I'm sorry, Marie. I only wanted to tease your emotions a bit; I didn't expect to put you through so much pain…are you angry?" he asked, looking at her.

She made an angry face. "Yes, I am angry." She said placing her hands on her hips. "That's wrong…I'm angry."

Stein could feel his chest tensing. The punch was coming…but then much to his shock, Marie began to giggle a bit.

"It is sort of funny though. What kind of experiment is that, Stein? Putting me into heat…hmmm you pervert! Were you expecting to get something out of this?" she said, pouting a bit.

"No, that was not my motive." Stein sighed.

"Alright, mister. I'll forgive you this time, but NO more of that ok." She warned.

Stein only smiled at her. There was no guarantee that he wouldn't experiment on her again…but he would be more cautious next time.

Putting Marie into heat…ahh she had been so unsuspecting…so innocent. It really was rather adorable.

All joking aside though…Stein really did care for her. No; he loved her. He realized he could never live without her…and that's why…he would never risk harming her in an experiment….

(A/N: Haha. Glad a bumped the rating up on this XD poor Marie! Lol and thumbs up for a slightly pervy Stein. One of my friends read this and told me "now I'm in heat. I'm horny from reading this".)