Part 5 of the series so far. Please read previous chapters for background. Enjoy.

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*****Polyjuice Potion and the squib chapter 5 Brittney Joins In*******
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It was a week or two later before my next sexual experience opportunity presented itself. Mum and
Brittney had been home for nearly 2 weeks and Brittney was home for the holidays. I had stayed home while she went shopping with her friends. I decided to make use of my time beating off to my movies I had made of sarah on my PC. What happened next caught me completely off guard…

I was right in the middle of a scene where sarah and I were having sex, Headphones on, Meat in hand, giving it a good hammer. I was humping the heck out of Sarah on the monitor and was almost ready to cum when I saw a movement in my peripheral vision. I stopped the video and whirled around to see Brittney standing in the doorway to my room, her face aghast…

I ripped the headphones off to hear what she was obviously about to say.

“What the hell are you watching?”she demanded, brusquely. “And will you cover yourself, PLEASE!”

I tried to collect myself. I popped my penis back into my trousers and pondered how long she had been standing there for and how much she had seen.

“Don’t you ever remember to knock? I was doing something private. Its quite normal actually.” I responded, matter of factly.

“With Sarah? How is that normal. you are sick, Mark. SICK.” she responded.

“Its not what you think.” I replied.

“How is it not what i think it is mark? you and Sarah were having sex. She’s your cousin mark! thats Incest! Not to mention Wrong and disgusting!” she responded.

“OK, Sarah and I were having sex but its not that simple.” I replied.

“Not that simple? I can see with my own eyes, mark. you had your penis inside Sarah. Wait until aunty finds out about this!” she responded.

“Please. Look you cant tell Aunty, It would ruin her. And like I said, it’s not that simple.” I
replied.

“Well if you think I saw different, then tell me what I saw then, because I am sure of what I seen and
it didn’t look good, Mark.” she replied.

“OK. Well let me start at the beginning. It all has to do with the project I have been working on
while you were away. I have been doing schoolwork, just not the kind that comes from my own school. I’ve been doing magic.” I reply.

“You’ve been doing magic? Mark, you are a squib. There isn’t a magical bone in your body!” she
retorted.

“I know that sis. But I found a type of magic that i could have a go at. Potions. It is the only thing
magic school teaches that doesn’t require magic or a wand.” i reply.

“Potions? You’ve been doing potions? Well, well done Mark. But how does that explain what you and
sarah were doing on the computer screen?”she replied.

“Well, we took some of the potion I brewed – ” i started to say but she interrupted.

“What potion did you brew? Cos if it was a love potion, those things are dangerous. And what you were doing is still wrong!” she replied.

“It wasn’t a love potion sis” I replied.

“well how did you two end up in bed together? If it was something to coerce her, Im telling mum!” she replied.

“Look – I didn’t coerce her. Have you ever heard of Polyjuice Potion?” I asked.

“Polyjuice Potion? Thats what you’ve been brewing? I don’t believe you” she replied.

“I can show you if you like” I responded.

“If you are going to show me proof, then it had better not be on your computer” she responded.

“Well, I guess I can show you the potion if you like” I replied.

“Ök – as long as I don’t have to watch the computer I guess its ok”she replied.

I went to my drawer and took out a bottle of polyjuice potion.

“This is it sis. the real deal” I proclaimed.

“So, this is polyjuice potion. This is really advanced stuff. Have you tried it? Does it really work?”
she asked.

“Yes it does work Brittney. And I have proof of it on my computer – and its not sexual” I replied.

“Well I guess I had better take a look then” she stated.

I made my way over to the pc and showed her the part where I turned into Sarah, making sure to only show her the change. She complained a little when she saw me in her older clothes, but her jaw hit the floor when she saw me change into sarah.

“I cant believe you actually did it mark! This is fantastic. Wait till I tell mom. But you still
haven’t explained why you and Sarah were doing what you were doing?”she stated.

“Well, it was kinda my idea. I did seduce her, but not how you think. Havent you ever wondered how it is for a guy? Or what the possibilities could be if you could change? Wouldnt you like to try it on?”
I asked.

“Well, I guess so.” she replied.

“So did Sarah. And I convinced her to try the potion. then one thing led to another. It wasn’t like I
took her virginity. We swapped bodies. I was Sarah.” I stated.

“So you fucked Sarah as yourself, and she was you? That doesn’t make it much better mark”she responded.

“Ï know. But I don’t think that girls are much different to guys. I think about sex a lot and it was
kinda like getting a free pass. Sex without losing your virginity. Sarah liked it too – i could tell”I
said.

“So how does it feel?”She asked.

“Tight and squishy. It was hard to get it all in at first” I began, but Brittney interrupted me before
I could finish.

“Mark! I meant the changing part! What does Changing feel like?” She asked.

“Oops, Sorry. Well, your skin kinda feels like its bubbling, but it doesn’t hurt.