The summer after my senior year of high school, my mother's younger sister Sarah came to stay with us for the entire summer; she had just finished college and was taking some time to find herself. The last time I had seen Sarah, she was 14, and I was 7. That summer Sarah, my sister Kim and I were inseparable. At 7, I felt pretty special having an aunt that was only seven years older than me. We spent every day playing baseball, catching lizards, or just hanging out around the pool.
Back then, she was a gangly 13-year-old tomboy that dressed like all us boys. I don't remember ever seeing her in a dress or skirt like my sister. Back then, she was a total Tomboy.
Mom didn't tell me she was coming to stay with us, so on the second to last day of my senior year, I came home and found my mom sitting at the dining room table talking to a woman whose back was to me. This woman had long dark auburn hair and whoever she was, had my mom smiling.
When my mom saw me, she said, "Johnny, how did your finals go today?"
At the same time, the woman with the Auburn hair stood up, and as she did, I could see she was wearing a loose-fitting halter top that was tied at the top around her neck and again around the middle of her back by a thin string leaving her back completely exposed. When she turned towards me, my eyes immediately went to her tits. It was apparent she was not wearing a bra. As she walked towards me, her large breasts jiggled and bounced with every step; her nipples looked like they wanted to poke through her top.
Now at the age of 18, most boys will get a hard-on just from someone saying the word "TITS," so seeing this auburn-haired beauty walking towards me with a smile on her face and her full round tits jiggling with every step, my cock instantly jumped to attention. By the time she got to me, my cock was at full attention and attempting to get out of my pants. I'm sure it was protruding outwards and visible. I had been wearing a loose pair of boxers, and my limp cock had been hanging to my left slightly down one of my pant legs. When I saw her jiggling tits, my cock immediately came to attention and was now forming a tent down my left pant leg. Without any time to adjust its position, I knew my erection had to be noticeable.
I was rock hard by the time she got to me, and my cock was straining against my pant leg to stand up straight.
She stood before me with a smile on her face, and her arms open said, "Don't tell me you don't remember your Aunt Sarah now Johnny. You're going to hurt her feelings."
I was dumbfounded. OMG, this tall, beautiful girl/woman before me couldn't be that same tomboy, Aunt Sarah. Aunt Sarah, who used to play baseball with them every day. I just stood there looking at her, trying my best not to stare at her tits and her hard nipples. The halter top she had on left her midsection uncovered, exposing a tan, flat stomach as well as her pierced belly button.
Seeing so much of Sarah's firm slender body caused my cock to twitch in my pants. I was sure she noticed.
As she leaned in to hug me, I tried to adjust my stance so she wouldn't feel my erection. She ended up straddling my thigh as she hugged me. I could feel my erection firmly pressing into her hip.
When she hugged me, she pushed her hips into me, and I could feel her pressing against my hard-on. There was no way she didn't feel it as she hugged me.
I heard her softly purr into my ear, "OH MY, Wow, very nice."
She then stood back from me with her hands on my shoulders and looking down at me, crotch, "Oh my, you are so BIG."
She then looked back over her shoulder at my mom and said, "Mary, your little boy is all grown up. He is bigger than most men I have known."
She then leaned in and hugged me again, and this time she whispered into my ear, "you sure don't feel and look like you are only 18."
She gave me a little kiss on the cheek that sent sparks through me.
As she turned and walked back to the table to join my mom, I noticed the shorts she had on. They had to be the shortest shorts I had ever seen. The bottom curves of her firm round ass cheeks were peeking out from under her shorts, which only added to my discomfort.
The sight of her round butt cheeks only added to my cock getting harder, and I was sure by now I had a precum spot in my boxers. I hoped it hadn't entirely leaked through my pants.
I quickly excused myself and went up to my room. I was dying to pull my cock out and jerk off, but the realization that it was my Aunt Sarah causing my erection, a wave of guilt washed over me. I set about cleaning my room, hoping that would make my erection subside, but the vision of Aunt Sarah's jiggling tits kept me rock hard.
I changed out of my school clothes and put on my gym shorts and a t-shirt. I broke out my school books in an attempt to study. I had two more finals the next day, so I needed to study. My mind kept going back to the image now burned into my mind, Sarah walking towards me and her braless full tits jiggling with every step.
I tried everything over the next hour to get her out of my mind hoping my cock could deflate. I lifted weights, which wasn't comfortable with a raging hard-on. I did sit-ups and pushups, and still, my erection wouldn't subside.
I was losing the battle with my erection, Aunt, or no Aunt; I needed a release. No matter what I did, my erection wouldn't subside. Giving up I went to the bathroom, which connects to my sister's room.
My sister moved out two years ago when she went off to college; her room had been empty for the past two years, and I had gotten out of the habit of locking the door leading to her room.
When I got into the bathroom, I immediately dropped my shorts and set my cock free. I took hold of my throbbing shaft and started stroking. Two or three strokes in, I had calmed down enough to get my sister's lotion out of one of the drawers.
I went back to stroking, and it felt so good. I had my eyes closed, concentrating on the image of Sarah walking towards me with her hard nipples and full round tits jiggling and bouncing as she walked towards me. I was getting into it and was leaning back against the counter, stroking my entire shaft from base to head. One hand stroking my shaft from base to head, and my other hand was holding my balls. Grunting and pumping my hips into my hand as I got closer and closer. Just as I was about to cum, the image of Sarah's firm round ass cheeks peeking out from under her shorts popped into my mind, and I blew my load.
I erupted with a huge load that I shot across the room. Big globs of my gooey cum landed on the glass shower door.
That's when I heard, "Wow that is impressive. I thought I felt that big cock against my leg. Very nice nephew."
I opened my eyes to see my Aunt Sarah standing in the doorway from my sister's room. She gave me a wink as she smiled and said, "It's time for dinner, wash up, and come downstairs stud."
I couldn't have been more embarrassed. Sarah closed the door behind her, and I was left standing there, holding my shrinking cock.
I quickly washed up and pulled my shorts back up. I was so embarrassed I didn't want to go downstairs for dinner. I tried to stall and think about how to get out of having dinner tonight.