The living room was dimly lit. The lights that were on rattled with a steady rhythm, generated by the action that was going on in the room right above me.
It'd been like this for half-an-hour now. Sitting downstairs listening to my sister getting fucked, it had felt almost like three hours. Truth be told, it probably would be three hours before they were done. During that whole time, I would be down here, squirming. With each thrust felt through the house, my sense of humiliation and helplessness grew, and with that, so did my cock. In the short time since my sister started getting fucked, I'd already beat off twice, to no relief. Each time I relieved myself, my frustrated arousal only came back twice as hard, and the fact that I had came by my own hand twice, while Luke had been fucking my sister the entire time and probably wasn't even near cumming, only added to my shame.
I stood at the bottom of the stairs, looking up into the darkness, imagining what it must have looked like in my sister's room. I could see my sister's bra laying just on the top step. I didn't know if she'd left it there on purpose to tease me, or if it had been ripped off and forgotten in the heat of the moment. Either way, I know I wanted it, but Luke had given me specific instructions; put one foot on the stairway, and I'd be fucking sorry. For a brief moment, I wondered if maybe I could sneak to the top of the stairs, beat off with the bra, and then put it back before anyone noticed. I had even begun to start walking, but a scream from my sister startled me, and I quickly went back to the couch, frustrated and humiliated.
The thrusting grew quieter. I knew they weren't done. I could envision Krystal on her knees in front of Luke, giving close attention to his cock, hungrily licking it up-and-down. Finally, she would take his cock in her mouth. She might try to do it slowly at first, trying to decide how many inches she can fit in her little mouth before it's completely full, but Luke wouldn't give her time for that. He'd just start facefucking her, getting his cock as far back into her mouth as he can. I thought about Krystal's red lips spread over his dick, muffled moans emitting from her mouth as she gets used to being fucked there. I wondered if my little sister had ever given a blowjob before.
I scavenged through the laundry room, looking for something, anything, to help satisfy me. Krystal had known Luke was coming over a week in advance. I didn't know until he told my yesterday. Surpisingly, it wasn't arousal that hit me when I first heard the news, it was more like anger. Of course Luke had always talked about fucking my sister, and yes, I had beat off to the thought of it more than once. He'd even gotten me into this habit of "borrowing" clothes from her out of the laundry. The deal was that I would bring her underwear to him, let him use them to beat off with, and maybe, if I did a good job, he'd let me use them afterwards. But that was one thing; actually coming into my house while my parents were gone and fucking Krystal was another. Hell, I hadn't even know that they'd been talking! I can still remember driving home, mad as hell at Luke for taking it too far, but even angrier at Krystal for allowing it to happen. The game had gone on long enough, I thought. This was no longer a fun little secret. This was about to enter my home.
There I was, marching towards my front door, ready to go off on Krystal. I was thinking about what I would say to her in order to sound like the responsible adult and convince her of the evils of promiscuity and blah blah blah, it never happened. I opened the door, and there Krystal, laying on the couch with her bare feet on the table, cell phone-in-hand. She looked up at me and gave me that cute, mischievous little grin of hers.
"Hi, big brother," she said. I could hear the snarky tone in her voice when she called me, "big brother."
"Krystal..."
"I'm texting, Luke," she said, and looked back down at her phone. She wiggled her toes in a not-so-obviously sexual way.
I tried to tap into some of that anger that I had earlier, but I found it had all melted away, replaced by a feeling of helplessness. Here I was, defenseless against my little sister. Luke was no doubt telling her all the things he was planning on doing to her, and he may have even revealed a few secrets about me. True, Luke had been the one to put me up to stealing Krystal's underwear, but he had a way with words, and I knew he could easily make it sound like I was the freak. Hell, wasn't I? For Luke, it was just another girl, but for me, it was my sister.
