My Sister's First Time

In the summer many years ago, my family rented a beachfront holiday home for a week. It was a nice, cozy place but a little run-down, with some holes in the wooden floorboards. On the fourth day of our stay, Mum and Dad went for a drive to visit some friends, leaving me and my younger sister Stacey at the beach house.

In the afternoon of that day, Stacey asked if I wanted to swim at the beach with her. I told her I would but just for a short time. We changed into our swimwear and walked together on the sandy path between the house and the water. I wore my blue board shorts and Stacey wore her pink one piece. We hadn’t bought new swimsuits for a while so our suits were getting a bit too small for us. My board shorts were tighter on me and went up to the top of my kneecaps, whereas before they had gone past my knees. The material of Stacey’s swimsuit had faded a bit, meaning it was see-through in a few small areas.

When we reached the water, we swam around for a while individually then met up and splashed each other around. It was during this activity that I began to notice Stacey was developing well in her wet swimsuit. Her breasts and hips had definitely grown from the previous year. Because her swimsuit had faded, I could notice a small but visible mound at the crotch of her swimsuit. This made me get a boner real quick, the outline clearly visible in my tight shorts. Stacey quickly noticed, pointed at my boner and giggled. Embarrassed, I mumbled to her that I was heading back to the house and walked out of the water as quickly as possible, with Stacey splashing my back as I turned away.

When I got back to the house, I kept my shorts on and went up to my room, sitting down on a chair to use my phone. After a while my boner went away and I quickly forgot about it. About half an hour later I heard the door of the house opening, indicating my sister was back. At the sound of the door opening, I instantly thought of Stacey in her swimsuit again, and I quickly got semi-hard. I became curious to see her in the suit, so I began to head downstairs before she could change out of her suit.

However, Stacey wasn’t heading up the stairs to her room to change. She was going to the downstairs bathroom, which was located right below my room. Glancing at the floorboards in my room, I got the idea that maybe I could sneakily spy on her through the cracks of the floorboards! I crouched down to see if there was a good spot to look from, and there was a nice sized hole with a view of the toilet, so I chose to look down from that one.

My first sight was of Stacey sitting on the toilet, still in her swimsuit and peeing. It seemed she was too lazy to take the suit off. I watched in excitement as the crotch of her suit got darker as her pee flowed out. When she had finished she let out a sigh of relief. She remained on the toilet seat though - it seemed she had something else to do. I watched as she put both her hands on her breasts, then sliding them down her swimsuit. When her hands reached the crotch of her suit, she stopped. She seemed hesitant and unsure about something, and it struck me that this might be the first time she had tried masturbating!

After thinking for a bit, she gingerly placed her right hand inside the fabric of her swimsuit and swirled in around, gently exploring her private area. At one point she pulled the crotch of her swimsuit to the side, revealing a small amount of pubic hair growing at the top of her slit. I was now fully hard and leaking. At the back of my mind I questioned whether it was the right thing to spy on my sister like this, but curiosity got the better of me and I remained where I was.

Stacey continued to play around with her swimsuit and crotch area. Suddenly, she took the index finger of her right hand and slowly began to play with something at the top of her slit. She rubbed this area for a few minutes, slowly at first then furiously. I watched her through the floorboards intently - sweat dripping off my face, heart beating fast and boner throbbing hard.

Soon, Stacey’s eyes closed, her head tilted back and she moaned loudly as her rubbing stopped and her orgasms came through. I could tell she was breathing heavily as she opened her eyes and stared down at her crotch, marveling at what her body could do. She softly gasped out “Wow!” as she continued to look down at her crotch. For some unfathomable reason, I decided to say “Wow!” as well, perhaps a bit louder than I should have. Instantly, Stacey had stopped looking at her crotch and was now looking at the ceiling of the bathroom, directly at me…