There wasn’t a lot of foreplay or dirty talk. The siblings were comfortable with each other in a way that felt very natural between them. Though there was nothing rote about their passion. They kissed with the familiarity of lovers, but they acted with the starving urgency of the ravenous.
“OK, you’ve made your point,” I whispered to Darcy.
She grabbed my wrist so tight it hurt. “No, not yet,” Darcy said, “Just watch.”
Sam pulled her brother’s shirt over his head and kept kissing him. Dave was well built, with broad shoulders, defined pecs, and only the very beginnings of a gut. He had a small amount of light blond chest hair that formed a “T” over his chest and stomach.
Dave reached over and pulled off Sam’s t-shirt. She wasn’t wearing a bra, and her breasts popped free. They were as small as I’d imagined, topped with light brown nipples that were screwed so tight they looked ready to pop off. I have to admit, there was something sexy about Sam’s tiny titties and washboard stomach.
Dave trailed kisses down his sister’s neck, taking her needy breast into his mouth. Sam gasped like he’d hit a live wire. I didn’t remember Darcy ever being that excited about nipple play.
My sister shrugged. “Everybody’s wired differently,” she whispered.
While her brother suckled at her teat, Sam reached down and started to undo his pants. For a moment, I saw Sam’s eyes drift over to the closet. The cute blonde gave us a little wink. I don’t know if knowing Sam knew we were there was a turn on or if it made this whole thing worse. Kind of both, honestly.
Sam pulled off Dave’s pants and underwear in one go, leaving her younger brother completely bare. They were still kissing, but now Sam was pushing Dave back onto the bed. She had her hand wrapped around his hardness and was slowly stroking him up and down. I noticed Dave had a perfectly serviceable dick, maybe a bit longer than mine but a good amount less in girth. Neither of us had anything to be ashamed of, certainly.
Dave shucked off his sister’s pants and now they were both completely naked. Their tongues danced in each other’s mouths while their hands plumbed at each other’s sex. Sam had a cute little bottom, pinkish. In her position I couldn’t see her pussy, but I glimpsed a small patch of curly blonde hair.
I didn’t need to see Sam’s snatch to realize what was happening next, though. The blonde girl shifted her bottom and her brother’s dick slipped into her body like a magic trick. Poof!
Sam and Dave both groaned simultaneously as they made that most intimate connection. Darcy elbowed me in the ribs, pointing at the siblings. As if I didn’t already see what they were doing.
They settled into an easy rhythm, Sam riding her brother. He leaned up and kissed her breasts. She reached down and strummed her clit. Both of them made lewd noises – their bodies squelching and sighing.
“Fuck, brother, you feel so good,” Sam said, “I love that big dick inside me. You going to do it? You going to give your sister your load? Make her cum on your cock?”
She stiffened, and I recognized the telltale signs of a woman having an orgasm. Sam’s body stumbled and her head fell back. Like she lost control of herself entirely for a moment. Then she popped back up again and kept humping at her brother.
Dave cackled. He grabbed Sam by the sides and flipped them both over. Now he was between her legs, pounding her pussy mercilessly. Reducing his sister’s words to nothing but cries and squeals. The both of them seemed to regress to an almost animal state, rutting on the bed. Darcy and I could have thrown open the closet doors and I doubted either would have even paused.
I’d watched plenty of people having sex on the Internet. This was different. There was something raw about being right there. Not just seeing them together but smelling them. Practically tasting it. It wasn’t polished and perfect like the sex I’d seen online. Dave’s cock slipped out a couple times. Sam stopped him once because the angle was hurting her. All of that reality made it more arousing, not less.
I could tell that both siblings were racing towards a climax.
“I. Love. My. Sister!” Dave said. Chanted. Again and again with each thrust. The bed slammed against the wall. Sam slammed into the mattress.
“Dave I’m getting close. Need you to… Want you to…”
Dave grunted. His body went stiff.
“Oh YES!” Sam cried. Her brother buried himself in her body and went stiff. Sam, on the other hand, seem to come alive. Arms and legs flailing.
Brother and sister flushed, then fell into each other’s arms.
“Oh God, baby, that was so good,” Sam said with a sigh.
Dave buried his head in his sister’s shoulder, laughing. “Man, what got into you today?”
“I missed my baby brother,” Sam said. But she was staring at the closet when she said it.
The two siblings lay languid together in bed. Lazing around in post-sex happiness and genuine affection.
Gradually, Sam got up and got dressed. She did it slowly, like she was enjoying her audience. She took her brother’s hand and pulled him up from the bed.
“Want to nap,” he said.
“Mom and Dad will be home soon,” Sam said, “They can’t know we skipped out of work for sex.”
Dave got up reluctantly and pulled on his clothes. Then the siblings left the room. A moment later, we heard the front door slam behind them and two cars drove off.
Once we were sure the coast was clear, Darcy opened the closet door. The bedroom stank of pussy, cock, and cum. My sister cracked one of the windows before we walked out of the bedroom. I guess it was a courtesy.
“See?” Darcy said as we walked down the stairs.
“Yes, you were right,” I said, “They’re having sex.”
“Have you ever had sex before?” Darcy asked, though she knew that I had not. Seemed kind of cruel of her to ask, to be honest. “Well, I have. And let me tell you. Sex is great, but it’s never like that.”
“Maybe he’s just, like, really good at it,” I said.
“No,” my sister said wistfully, “He’s not.”
“You and…”
“My, um, thing?” Darcy said, “My fetish?”
“The incest thing,” I said.