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I grabbed a train from the nearest station, the Doctor had said that I probably wouldn’t want to do anything to strenuous for a day or so and walking all the way back home was definitely not an option.

Thirty minutes later I’d got home, it was only 2pm so my sisters and my mom wouldn’t be back for a few hours.

Our house was by no means a mansion, but with four bedrooms, a dining room, a large kitchen and a spacious lounge, it was a very good home. My mother had bought it with the money she had gotten from the divorce of our father, the least he could do for cheating on her so much, and she’d worked incredibly hard to make it as homely as possible.

My mother was 39, with short brunette hair cut into a bob. Her tanned skin and large tits tended to get her lots of attention, but she hadn’t had a boyfriend since she divorced my father.

We, both of my sisters and I, hadn’t seen our dad since he left when I was 8. Good riddance to bad rubbish.

My eldest sister, Nadine, was only older than me by a year, but she was Mom’s golden child. She’d graduated with good grades, walked straight into a job as visual editor with one of the local media firms, and seemed to be successful at everything I wasn’t. Like Mom, she had humongous breasts, and her slim waist, pale skin and toned butt grabbed at the eyes and commanded the attention of every red-blooded male in the room.

My younger sister, Amy, was 18. Still in school but doing better than I ever did when I was a student. Amy was tiny compared to my mom and my older sister, with a slim frame and tiny, pert breasts. She’d taken to dying her hair blonde, and cutting it shorter than Mom’s, giving her an elven appearance that, when combined with her school uniform, fuelled many of my late-night fapping sessions.

With the house empty I headed up to my room, stripping out of my clothes as soon as my door shut and heading towards my ensuite bathroom. I stared in the mirror. I’m not very tall, at only 5ft 10”, and my lifestyle had taken a small toll on what was once quite an athletic body. Fat hung slightly over the waist of my tight boxers. I stripped them off, disgusted with myself once again for not going to the gym.

I looked in the mirror again, pleased at least that whilst I had gained weight since I had been at school it hadn’t begun to hide my pride and joy. My dick wasn’t humongous, but at a healthy 7” (I’d measured it with a tape measure, don’t judge me) I had always been less self-conscious about it than I had other parts of my body. Shame I’d never gotten to use it properly.

I reached into the shower, turning the dial so that water began to sputter out of the shower nozzle, and waited impatiently for the water to heat up.

After a minute I stepped in. The water was blissful, and it cascaded down my body as I began to lather myself with shower gel. My hand fumbled for my cock and Sarah, bent over, flooded into my mind. I stroked myself, first gently, feeling the blood pump into my semi-hard member as I dreamily imagined lifting the hem of Sarah’s uniform. Then furiously, as I imagined what it would be like to slide it into her soaking wet pussy, hearing her moan my name over and over again.

“Jake?! Jaaakkkke?!”

Who the hell was that? The handle to my bathroom door rattled and it flew open as Amy entered, staring bright eyed around the room. I’d pressed myself behind the half open shower curtain and wished that I could just be invisible. This was so embarrassing. Why the hell had she just barged in? There was no way she couldn’t hear the shower.

She frowned, puzzled by the seemingly empty room, and stepped towards the shower, opening the curtain and exposing my soaking naked form to her view. She just looked confused, showing no indication that she had seen me. She turned the dial to off and walked out of the room.

What the hell had just happened?

I hesitantly left the shower and grabbed a towel. Looking to the fogged-up mirror, I used the towel to clear the condensation. The towel appeared to be floating on its own, suspended in the air. I couldn’t see myself anymore. I moved the towel left and right, watching, perplexed by my absence in the reflection.

“What’s happening?” I whispered, struggling to believe the evidence of my own eyes.

I remembered my wish, I’d wanted to be invisible, to not have the humiliation of flashing my sister, and poof, now I’m invisible.

I tried wishing to be seen again. I stared in astonishment as my wet body materialised before my eyes. I tried wishing for my fat to disappear and…. nothing.

Okay, so I didn’t have magic wishes.

I tried wishing to not be seen again and I watched, in utter delight, as I faded once again.

“Cool, holy shit,” I whispered as, at a thought, I reappeared.

Is this because of the injection the Doc gave me? I couldn’t think of anything else that could possibly have given me this power.

“Mmm, Jake, yes!” I heard the muffled moans of my sister coming from my bedroom, and, thinking quickly, decided to activate my power. I dropped the towel and peaked around the door.

Amy was lying on my bed, her pleated school skirt over her waist as she rubbed furiously with her right hand at a dampening patch on her white cotton underwear. She held my sweatshirt in her left hand, pressing it to her face to stifle her moans.

“Please, mmm, God yes, please finish, mmm, inside me,” she moaned, squirming as her hand rubbed quicker and quicker against, what I now knew, must have been her clit.

I had no idea that Amy thought of me like this. She was my favourite sister, by far, but she had never led me to believe that she wanted me in this way.

I wanted to edge closer, and I moved stealthily into the room, my invisible form giving no hint to my sister that I was anywhere nearby. I tip toed, being as quiet as I possibly could, until I was at the side of my bed.

Amy lay with her head on my pillow, eyes tightly shut as her hand worked feverishly to get herself off. Her panties were soaked, and I could see her pussy through the now near-transparent fabric.

With a judder and a squeal she came, moaning intensely into the fabric she gripped to her face.

“Mmm ohhhh God!”

She opened her eyes, scanning the room in apparent panic that I may have walked in on her. Happy that she had been undisturbed, a fiendish smile appeared on her face as she moved her now sweaty fringe out of her eyes.

Her tight fitted white shirt showed off her erect nipples, and her reddening face began to cool as her panting slowed.

She hopped up from the bed, placing my clothing back the way she had found it, and left the room.

Even though I had just masturbated in the shower my cock was stiffening. The smell of Amy’s orgasm hung in the air, a sweet, slightly musty, tang that I now recognised as a common smell from the past four years. The naughty girl had been sneaking into my room to do that regularly and I had never known.

I wished to be visible again, watching in awe as my power responded and grinning sheepishly at my renewed erection.

I was going to have to do something about that.