I'm sure many of you are assuming that after watching my sister Jenny shower that summer night, that I spent the following days and weeks trying to push things further and further until I eventually had her riding me cowgirl in my bed with her DDD's bouncing in my face as I sucked on her nipples and relentlessly slapped her big booty, culminating with my shooting a huge load of jizz into her pussy.
Well, pump the breaks on that, because that isn't how it happened. I woke up the next morning, immediately remembered what had happened, and felt my cock growing under the sheets. I knew I needed to take care of that problem, so I started stroking it gently as I pulled up some pictures she had posted online to give myself a visual aid. I scrolled through the pictures until I found one to my liking.
The picture in question was of Jenny and two of her friends who I remembered meeting when I helped her move into her dorm once. On her left was Bre, a 5'7"ish blonde with piercing blue eyes, solid D cup tits according to my best guesstimate, and an ample butt. She was a lacrosse player so she had a bit of a thicker build, but it was definitely a turn-on. Her red, white, and blue bikini really showed off her features, and I was getting harder just looking at her. To Jenny's right was Allie, a short, tightly built cheerleader. She had small, but perky boobs, and a similarly sized behind, and her white one-piece suit really made her tan skin pop. As sexy as both of these girls were, it was Jenny who stole the show. She wore a black bikini with a bandeau top that was certainly not big enough to cover her bulging tits, and her friends weren't helping her cause. Bre had her left hand pushing up Jenny's left breast, and Allie was mirroring her on the opposite side. Jenny's tits were practically falling out of the top of her suit.
I squeezed some lube onto my hand and started rubbing the head of my cock, with my eyes laser-focused on Jenny's incredible body. Soon, I felt pre-cum begin oozing from the tip, and started jerking harder and harder. I closed my eyes and imagined the scene I described earlier. Jenny impaled on my dick and furiously hopping up and down, giant tits swinging and hitting me in the face as she rode me. I imagined my lubed up hand was her wet pussy, and I felt my cock start throbbing, and after a few more strokes I was shooting thick ropes of cum into the air and watching them fall back down around the base of my dick. Breathing heavily, I grabbed some tissues and cleaned up the mess I made.
I opened my bedroom door and after a quick look around, and found my house empty, which was not unusual. It was a Friday, and already 10:00 AM, so my parents were off to work and Jenny was most likely at the gym. I decided to take a shower to clean myself off a bit better, and used the same shower where I had spied on Jen soaping up her giant tits and ass barely twelve hours earlier. The thought was a major turn-on, and by time I was done in the shower I was rock hard again.
The house was still empty, so I decided to do something a little crazy. When I left the bathroom, instead of turning right toward my bedroom, I walked straight ahead and turned the knob on Jenny's door. I opened it slowly, as if I expected her to be in there. I was understandably a bit paranoid. I opened her top drawer and found the gold mine I was looking for: bras and panties galore. I was still nervous, so I quickly looked through my options. I didn't want to take anything that Jenny would notice was missing, so I just grabbed a generic tan bra and got out of there, careful to leave everything as I found it.
Still hard, I was back in my room with my new found treasure, a 36DDD bra courtesy of Jenny. I wrapped it around my dick and began to jerk off for the second time in about 25 minutes, and thanks to a surprise, it didn't take me long to complete the task. I was pumping my right hand up and down my 7 inch dick when suddenly I heard the front door open. Jenny yelled out, "Derrick, you up?" and I was overwhelmed by the situation. The combination of my sister's huge bra in my hand and her calleing out my name caused me to cum immediately. I shot my load into the right bra cup, and quickly cleaned myself, throwing the bra under my bed. I had planned on sneaking it back into her drawer, but I guess that was out of the question now.
I called back out to her and said I would be down in a minute, throwing on some clothes. Walking downstairs, I saw Jenny taking off her drawstring backpack and almost had my heart stop. She was wearing a surprisingly deep cut sports bra, and her tanned tits looked incredible all smashed together. On her lower half, she wore a pair of barely-there spandex shorts that her abundant ass cheeks were practically hanging out of.
