I rolled off of Shea and pulled the blanket over us. I was in shock and didn't know how to react. Not only had I just fucked my own sister, but on top of that, we just got caught by her 2 roommates. This was bad. As I struggled to find something to say, my sister spoke up calmly.
"Shit Megan, you were right. At the end there I thought I was going to black out."
"I fucking told you!" said Megan excitedly. "Between his cock, his body, and his technique, I thought he was going to kill me!!" Suddenly, she started tearing off her clothes. "Move over. Watching you guys do it just now has me so worked up I can't stand it." She practically jumped in bed between us and started kissing me.
"Whoa, slow down. Hold on now, I need a minute here. "
"Fuck that, I want it." She practically shouted.
"Well, I just came twice, so I'm not ready either way. Can you please just give us a minute?"
"Fine," she said. "Just don't take too long." She bent over and took my flaccid cock in her mouth, still covered in our co-mingled fluids and fresh from Shea's ass. "I think I'm addicted now. You turned me into a junkie." She jumped off the bed and grabbed Ashley's hand. "Come on Ash." Ashley was still standing there like a deer in headlights. They quickly went to Megan's room and slammed the door. Instantly I could hear the mattress moving.
"Are they gonna...?" I asked.
"Oh, yeah. All the time." Shea replied.
"Do you ever..."
"Sometimes. When I'm drunk."
"Wow, this is a strange day." I said as I tried to think of how to talk about what just happened.
"Listen," said Shea, "I know this is weird and a lot to process, but don't get too worked up. I have been getting hotter and hotter since you came home, and I needed this. It was fantastic and I would love to keep doing it, but not if it is upsetting to you. I don't want to get married to you, I don't want to move to a new town so we can live in secret, I just enjoyed it and I want to keep enjoying it. If it's too weird, that's okay. You're still my brother and I still love you. If not, fuck it. Let's go for it."
"So you're okay with this?" I asked.
"As long as you are." She said as she looked at me with loving eyes. "That's more important."
"I think so, but it might take a little while to soak in."
"Well I don't think Megan is going to wait." She laughed.
"You're okay with that, too?"
"Who cares? You're not my boyfriend. Besides, we have a pretty open house."
"So I hear." We could hear Megan and Ashley next door going at it, and I unexpectedly started to stir.
"I have to use the bathroom. I have fluids leaking out of every hole. If you're up for it, you should head in there."
I rose up and went next door. I opened it slowly and saw the two girls side by side in a 69. I watched the two dancers' sweaty bodies roll around together, with each girl's face buried in the other ones crotch. The bedsprings cried out underneath the aggressive coeds as they licked, fingered and sucked each other wildly. The room reeked of sex, which made my nostrils flare, and the sounds of sucking and flesh slapping was an assault on my senses. Every now and then, one of them would let out a loud groan, which made my balls twitch. I was getting more and more turned on and absent-mindedly stroking my cock and bringing it back to life. I stood there for a few minutes until Ashley saw me.
"Um, hi," she said.
Megan turned over and looked at me, "Are you coming?"
Ashley spoke up, "Megan, I don't know if I'm ready for that. Joe is the only guy I've ever been with, and I am a little weirded out after watching them. I don't know if I am comfortable with brothers and sisters...you know."
"It's cool, Ash. I don't blame you. You should talk to Shea and let her know how you feel. I wouldn't want to ruin your friendship. I'll catch you later Megan."
I went to Shea's room to get dressed, and then I parked myself on the living room couch, alone with my thoughts. Shea came out and turned on the TV. Other than snuggling up against me, which was nothing unusual, she gave no indication that anything had changed between us. I think that is what made everything okay for me. If we were cool, then why not enjoy ourselves. We laughed about the sounds coming from Megan's bedroom, and when the other two girls finally came out, Shea piped up.
"I'm starving. We were supposed to eat two hours ago. Let's go." Everyone sort of shrugged and giggled, and we left.
After dinner we met up with some of my friends at O'Reilly's again, where I took some shit from my buddies for showing up with 3 hot chicks. Megan had called their friends to let them know where we were, so I said, "Wait a few minutes and the rest of their friends will be here." Sure enough, five minutes later six smoking hot dancers walked in to the bar.
"Holy shit!" my friends said in unison, earning some smacks for some of them from their respective girlfriends. The girls crowded around my sister, Megan and Ashley, and gradually every single guy in the bar had moved closer to our little group. I guess nine of the hottest girls on campus have an effect on people. My sister noticed the migration, and we exchanged a sly grin.
Halfway through the night, Ashley found me and said, "We need to talk." She dragged me to a corner and really looked upset.
"I am really struggling with what happened tonight. I have always been taught that it was wrong and it was really disturbing for me. I'm having a harder time, though, with the fact that watching you really turned me on. The fact that it was wrong made it even hotter. I don't know how to feel."
"Listen, Ashley," I started. "I have always believed the same thing. Before today, I had never even looked at my sister like that, and until 6 hours ago, I had never even entertained the idea. I don't know what happened between us today, but whatever it was we lost control and went with it."
"I just don't understand it. There are so many girls on this campus that you could take your pick from. Shit, after I saw you with Megan, I was probably going to fuck you. Now I don't know."
I looked her over just then and I hoped she wouldn't change her mind. If Megan had the best body, Ashley was easily the hottest one of my sister's friends. She had long curly red hair, and huge emerald green eyes. Her face had a youthful, elfin quality, with a freckled, lightly tanned complexion. She looked like a tourism poster for Ireland. Tall and almost waifish, 5'10 or 5'11, she had long, model perfect legs, nice wide hips, a tiny waist with a tight, flat stomach, and nice heavy D-cup tits that were almost too big for her frame and pointed straight forward. Her ass was hard and perfectly round with a shelf that looked like you could set your drink on it. But it was the way she carried herself that sold her. The other girls all flitted around on their toes like ballerinas. Ashley moved like a cat. A predator. Looking at her made my nuts twitch, and thinking about sex with this girl made me want to leave the bar right now.
"Oddly enough, I don't even feel any guilt about today. We talked about it and we are both cool. I don't know if it will happen again, but we're okay either way. We're not trying to start a relationship or plan for the future, we are just having fun until I leave. And yes, the fact that it's wrong makes it hotter. If it bothers you, I will talk to Shea and we will work something out. I don't want to affect your friendship."