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I awoke in daze. Peering at the clock it read 6:47am, much earlier than I normally wake up on a Tuesday. It was summer after all, college was out and my twin sister and I were gonna be attending the local university in the fall. Why was I awake? I normally slept in until 7:30 to my alarm.

Then I hear a soft, muffled moan through the wall. My sister and I had our own rooms on the second floor. Our beds paired against the same wall length wise since our rooms are fairly small. Being the older of the twins by minutes, had a few extra square feet, enough for a small desk but that was it. Only a bathroom, small loft, and laundry room populated the second floor. It was mostly above the three car garage with our parent’s master bedroom and living spaces down stairs.

I paused, waiting to hear something again. My morning wood dying down concerned for my ‘little’ sister who was only minutes younger than me. I looked at her like that since she was physically smaller than me. She was short with a very small torso and long legs. We were both nerdy kids who mainly enjoyed playing games and watching science fiction movies. We were best friends and really never went out or partied like many of our fellow youth. We were content in our happy lives.

These thoughts randomly passed through my mind as I waited… 6:52 appeared on the clock when the second muffled sound came through the wall. I was concerned for my sister but intrigued. This had never happened before and I was unsure of what to do. Neither of us really had any boyfriends or girlfriends. We were sort of sheltered through our lives. Our parents were hard working people who went to work by six-thirty and came home about five-thirty. We sat and ate dinner together and watched television every evening. The perfect family.

As I pondered these things, my morning wood started to return as I considered what was happening in her room. Without realizing it, I was now softly leaning against the drywall and wood frame that separated my sister and I by only a foot. I didn’t even realize it until the clock read 6:54 and a third soft sound penetrated the walls. It was a sound of pleasure that could only be explained in one way. She was masturbating.

Shocked, mortified, but most importantly I was incredibly aroused. I never considered my sister as a sexual person. I guessed she masturbated and I’m sure she knew I did but I never considered the possibility of hearing it. There it was, however, another soft moan. My morning wood was quickly turning to morning steel.

She must have assumed I was still asleep and was taking some liberties with herself. It made sense to me but I couldn’t help pressing my ear harder against the drywall hoping for more of this luscious audio. Without thinking I had slipped my hand to my throbbing member. The summer was hot and a thin white sheet was all I needed during these summer months.

Then again… a soft, muffled moan escaped her lips and passed through the wall. The pace was slowly intensifying and I was trying to match my strokes to the sounds escaping the wall. She was petite despite the fact that we were twins. Not identical, we did have several genetic differences. She was long legged and petite like our Mother while I was taller and stronger like my Father. We did have similarities in personality in our superior academics and hobbies.

My mind was now racing, waiting for the next sound. I was now thinking of all those times we passed by each other in the morning. She would be wearing only a long t-shirt and I assumed some panties underneath. Her breast had developed into perky B cups or maybe small C cups. I had little experience in this field and couldn’t judge. Her nipples were sometimes erect when I saw her but she was my little sister. I was her big brother and protector. She was my best friend. I had never wondered of her in any other way until now.

NSFW: yes

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