I threw the blankets off and blasted down the hall at full speed. I didn’t even knock. I threw her door open in rage for the second time this month. Jenn was laying on her bed, reading some bullshit teen magazine. Probably reading something about “How to get your way by being a bitch”.
I shut the door behind me, barely able to contain myself enough not to slam it.
Jenn looked up startled, ready to chastise me for invading her privacy or whatever.
“Dude you fucking sold a bottle to mom!?” I half shouted, half whispered through gritted teeth.
“No man relax!” she reeled back and sat up on her bed, ready to defend herself. Huge tits rocking side to side under her oversized night shirt, nipples poking through as they brushed the cloth. As pissed as I was, I had to steal a few glances. “You think I’m the only one that sells it? We got distributors and shit now dude!” She defended herself. It was a weak defense though. “How do you even know mom has some?”
“I just had to listen to her use it for 20 minutes, asshole!” I admitted. I was too pissed to even censor my own admission.
“You can hear that?… Through the wall?” Jenn asked through a half-cocked grin, cutely scrunching her forehead.
“We got thin walls, okay!? Don’t sell her any more, you sick fucker”. I stormed out and nearly slammed the door behind me.
—
The next night I was much more careful. I listened for every sign that it may be mom on the other side of the wall. I couldn’t bear busting another nut to my own mom. It just didn’t seem right.
The splashing patterns of her shower routine seemed much more familiar this time. It was definitely my sister Jenn this time. I pulled my sheets down slowly in anticipation, feeling the cloth slide past my thickening cock in anticipation of what was to come.
The squeak of the shower knobs turning off could be heard, followed by the sounds of Jenn toweling off her cum-inducing body.
I heard the towel hit the floor and readied myself, beginning to tease myself to full erection. I brought my index finger to my tongue, coating it in warm saliva and began fingering the underside of my cock, feeling it twitch and throb. My breathing becoming more labored as I prepared to listen to my sister slather her voluptuous body in my cum.
Just as I heard the gentlest sigh of satisfaction pass from her lips and through my wall, my bedroom door unexpectedly flew open.
Panicked, I threw my sheets over my throbbing member. The black silhouette of a pony-tailed female bounded through the opening and stealthily clicked the door shut behind her. I pulled my lets up just in time as she dove onto my bed. She perched onto her knees toward the foot of my bed, pushed up against the wall.
“Is she doing it?” The figure whispered excitedly.
I sat up. The street lamp outside my window offered just enough light to make out a face.
“Jenn?” I blurted a bit too loudly, confused.
“Shhhh!” she hissed as she pressed her ear up against the wall.
“What the fuck are you doing?” I whispered angrily. She just put her finger up to her mouth and stared blankly past me as she listened intently through the wall.
It only took a second to realize what was going on.
“Dude. You’re a sick fuck. Seriously?” I said with as much incredulity as I could muster, as hypocritical as it sounded coming from me.
She grinned a mischievous grin and bit her bottom lip sexily as she flashed a knowing glance at me.
I just sat there dumbly for a few moments, wondering what her intent was.
Finally I could hear some shuffling through the wall next to me, but resisted the urge to listen in. It was mom after all. I supposed I should have thanked Jenn for stopping me from jerking off to mom again.
Jenn’s mischievous grin faded and slowly turned into a look of pure concentration. She could hear something. I found myself gradually fighting the urge to put my head against the wall.
Suddenly Jenn’s expression changed to one of apprehension. Her eyes widened and she looked over at me, locking eyes with me. She looked worried. the letters “O M G” silently formed on her glossed lips.
“What…” I anxiously asked. Jenn’s expression almost made me concerned for our mom in the next room.
Jenn reached over and grabbed my shoulder, pushing me toward the wall. I faked resistance briefly as if to suggest that we shouldn’t be invading mom’s privacy, but my curiosity had made up my decision already. I suctioned my ear to the wall and was immediately greeted with the soft, sweet mewls of utter satisfaction and that faint sucking sound I remembered so clearly.
“She’s not putting on lotion, dude” My sister whispered to me.
“Dude this is perverted” I whispered back, faking concern at this point. “We shouldn’t be listening to mom… doing that”. I too had climbed up onto my knees and was listening intently as I said the words.
My sister was grinning wickedly at me.
“I bet she’s using your cum” She said, staring at me, looking for a reaction from me. Her eyes flicked down to my lap very briefly when my cock was laying flaccid between my legs covered by the thin sheet.
“You’re sick dude” I responded, being careful not to let my cock grow. I couldn’t let my sister know I was getting anything out of this. I would never hear the end of it from the girls at school once Jenn told everyone.
Mom was beginning to moan unabated at this point and the palm of her hand could plainly be heard slapping into her soaked lips as she finger fucked herself rapidly.
The sound paused for a moment and a plastic clicking sound could be heard. The sounds resumed again.
“Sounds like she just poured more of your cum on her pussy, bro” My sister whispered sexily at me, glancing down at my cock a little more obviously this time. She was challenging me. The thought of mom fucking herself only feet away with her cunt and body covered in my cum would have disgusted me before tonight, but right now I was struggling to keep the sheets from tenting.
The outline of my cock was now pretty apparent. It was still laying down in the channel of my pushed-together thighs but had filled with blood just enough to make the shaft and head somewhat visible in the faint light from outside. I was losing the battle. I looked at it, willing it to stay down. I couldn’t let it get hard with Jenn sitting right next to me.
The sound briefly changed on the other side of the wall into a much more rapid flicking sound. Mom’s moans became more labored and breathy. Jenn leaned over toward me slightly, her huge tits barely hanging down into her oversized night shirt. Her face only inches down the wall from mine. Her lips parted.
“She’s flicking her clit, Jackie.” She whispered breathily. Her mischievous grin completely gone now. “She covered her clit in your cum and now she’s flicking her fingers back and forth over it”. She said in a very serious and very sexual tone, eyes locked to mine.
Immediately she leaned back onto her haunches and giggled hysterically. She was being a nasty bitch, but she was achieving her goal.
As she threw her head back, giggling to herself, I glanced down at my lap. To my horror, my cock had released its self from between my thighs and was pushing the sheet upwards. It was getting hard as fuck. The head was clearly pronounced, and the veins could be seen sliding along the underside of the thin fabric as it made its way slowly upward. I began thinking about chores, puppies, gay porn, anything to distract myself from my current state.