"You're always top of the class! I'm so jealous!" said Paula. "What's your secret?"

The girl had sat next to me on our first day of college, and we had struck up enough of a friendship to chat every morning. We probably looked an odd pair - her with her camo jacket and piercings in her ears and nose, and my own mousy bespectacled appearance. If we were still in highschool then everyone would be gossiping about the bookish nerd who had never been on a date in her life chatting with the butch girl who didn't bat an eye when she talked about her love of BDSM, but in college there were stranger sights every day.

"Oh, well, it's kind of embarrassing, so don't tell anyone?" I said, careful to look around to make sure nobody else was listening. "My mom and dad used to call me 'good girl' whenever I brought home a perfect score on a test, so I did some Pavlovian training to see if it still worked."

"Like Pavlov's dog? The one that drooled whenever he rung the bell?"

"Yes, exactly! I recorded myself saying 'good girl' and all this other stuff about how nice it is to get called that, and I listen to it when I'm studying for tests so I associate remembering the answers with feeling happy, and... sorry, it's just weird, isn't it?" I mumbled, trailing off.

"No way, it's such a good girl thing to do." she said, suppressing a grin.

I blushed a little, hearing the phrase from another girl. "Anyway, please don't say anything about it to anyone else?"

"Yeah, sure." she said. "See you later, good girl!"

From then on, she'd slip the words into our conversations. Firstly just to tease me, a private joke between us, but she eventually seemed to forget about why she had been saying it.

But I didn't forget. I couldn't forget. Those were the same words looping in my ears every time I was studying.

"Good girl, good girl, you want to be a good girl..."

I did want to be a good girl. But that gradually took on a new meaning for me. It wasn't just grades that'd make me a good girl, after all. She called me that when I brought her an extra snack, or when I complimented her on dyeing her hair a new color. It felt better and better to be called a good girl by the girl who was rapidly becoming the most important person in the world to me, whether she knew it or not.

Weeks and weeks went by of our class together when suddenly she was off for a day. Maybe she was sick, or had somewhere important to be, but I felt myself missing her morning greeting. Felt myself longing for her to call me a good girl.

Later when I was studying, listening to my motivational hypnosis file, I found my thoughts turning to her voice saying the words instead. And with that in my mind, my hand crept under my skirt, rubbing at my panties while I imagined it was her fingers playing with me.

"Good girl, good girl, you want to be a good girl..."

I whispered along with my own recorded voice, dreaming of my voice becoming Paula's, the mantra becoming a command. I felt myself building up to an orgasm while thinking about Paula touching me, the bliss making me drool like Pavlov's dog...

The next day I couldn't even look her in the eyes. I had played with myself, thinking about her calling me her good girl, and the thought of her saying those same words today was almost too much to bear.

"Hey, what's up, good girl?" said Paula, leaning in close to me.

I shivered in delight at the words. They were having more and more effect on me. Between my self-hypnosis and her reinforcement of the trigger whenever we had friendly conversations, I didn't think I could refuse her if she asked me anything.

"Come on, good girl!" she said. "Let me look at your notes for yesterday!"

I handed her the notes without saying a word, my thought process overridden entirely.

"Wow, you're really spacing out! I thought you'd tell me I should keep better notes! You're such a good girl!"

"I can't concentrate on anything." I whispered, not wanting anyone else to overhear. "Can you... can you please stop saying that?"

"What, that you're spacing out?"

But when I shook my head, she asked me to go outside the lecture hall. We ducked into an empty bathroom.

"Sorry." I said. "It's... it's those words. It's... really distracting."

"What words?" she asked.

"When you call me a good girl... I can't think about anything else." I said. "I think I've hypnotized myself so much that I can't stop, that I don't even want to stop, because it feels so good... and I think it might be ruining our friendship because whenever you say it, I want to do whatever you say. I..."

She put a finger on my lips. "Shh. Good girl." she said, as I stopped talking. "There's an easy way for us to make this work."

She put her arms around me, and pulled me into a tight hug. Before I could even think about protesting, she breathed a husky whisper with her lips so close to my ear.

"Do you want to be my good girl?"

I gave her my answer.

"Good girl." she said, walking hand-in-hand with me back to her apartment.

She spoke command after command, and I wanted to obey every one, knowing the praise she would give after each.

"Good girl." she said as I stripped for her, showing my naked body to another girl for the first time.

"Good girl." she said as I let myself drop to my knees before her.

"Good girl." she said as I lifted my head to let her put a collar around my neck, her hands gently adjusting it until it was a perfect fit.

"Good girl." she said as I secured myself into the stainless steel chastity belt she had given me, the click of the lock making my heart pound.

"Good girl." she said as I handed her the key on a silver chain, draping it around her neck.

"Good girl." she said, a smile creeping on her face as she raised a foot in front of me, still in the sock she had been wearing all day.

"Good girl!" she said, a small moan escaping my lips as I kissed and licked that foot.

"Good girl!" she said, slipping out of her leather pants as I panted in anticipation.

"Oh, such a good girl!" she said, spreading her pussy at my eye level while I started drooling onto my bare breasts.

"Mmph! Good girl!" she said, my tongue lapping eagerly at her clit.

"Oh yes! Good girl!" she moaned, reaching a squirting orgasm as my own juices soaked the chastity belt.

"I've got a class to go to." she said, stroking my hair as I sheepishly knelt before her. "Why don't you be a good girl and wait for me to come back?"

As the door clicked shut behind her, I was left alone to dwell on what my life was going to be from now on. Kept in chastity, collared and submissive, locked in her room for her private use. I had came just from her treating me like a human pet, the humiliation and obedience making my mind go completely blank in pleasure. I was still a virgin, but I couldn't imagine how sex could compare to worshipping my new owner.

I had been turned into the beloved pet of my best friend through my own self-hypnosis and it felt like a dream come true. My heart was beating faster, but my brain was telling me those same two words, over and over. The two words I had told her about that had short-circuited my brain, making me only fit to please her forever.

I'm not Pavlov's dog any more.

I'm Paula's.