Establishing dominance and vocabulary

"Alright, let's get this party underway. Just act normally; I'll be making the rounds as if this were any other birthday party, so feel free to acknowledge when I'm nearby. But, I want sex to be the default topic of conversation; brag about your greatest lays, ask and offer advice, and comment on each other's bodies. Nothing is off-limits. Don't be afraid to get handsy, either! I'm going to be grabbing and groping whoever I want, and I want to see all of you doing the same."

As if they'd been waiting for the opportunity, quite a few hands jump to the tits and asses next to them.

"That doesn't apply to me, though. Unless I tell you to, no one touches me without politely and eagerly asking my permission. You will address me as 'sir'."

"Yes, sir!" the whole room answers in unison, and your dick twitches in your pants. You've got to have some fun with that.

"Let's go over some terminology. I don't want to hear any euphemisms or clinical terms. Repeat after me..." You pull Caitlin in front of you, reach around her sides, and shake her athletic breasts.

"Tits."

"Tits!"

Pinching her nipples, you turn Caitlin around and squeeze her toned cheeks.

"Ass."

"Ass!"

You nibble that ass for a moment before spinning her back around and spreading her legs so you can massage her dripping lips.

"Pussy."

"Pussy!"

"Cunt."

"Cunt!"

You unzip your pants and poke your throbbing member out between Caitlin's thighs so the crowd can see it.

"Dick."

"Dick!"

"Cock."

"Cock!"

Angling your dick upward, you slip inside your sister and thrust almost by instinct.

"Fuck..." you mutter, surprised by how firmly the walls of Caitlin's pussy grip your shaft.

"Fuck!" your audience, who you'd nearly forgotten about, parrots back.

"Fuck," you repeat, watching your mom's hungry eyes as they followed your dick in and out of her eldest child.

"Fuck!" she seems to shout louder than anyone, her hands creeping unconsciously to her own crotch.

"Fuck!" The surreal sexiness of the situation already has you on the edge, and with one final chorus of "Fuck!" you blow your load as deep inside of your sister's womb as you can reach. You pause there for a moment, enjoying the feeling of her body against and around yours until your orgasm fully subsides. When you finally do pull out, you whisper an instruction to Caitlin.

She squats low, digging her fingers as far up her cunt as she can to pull out a fistful of your fresh seed. She smears it all on her beautiful face before licking her hand clean. Indicating this creamy organic face-mask, you give the class their last vocab word;

"Cum."

"Cum! Cum! Cum!" they cheer, applauding your sister's degradation.

"Tits, ass, pussy, cunt, dick, cock, fuck, cum," you say as the noise settles, "this is the language I expect my sluts to use. Today, that is all you are; my sluts. My whores. My bitches. You will treat me with the respect I deserve as your master and your masculine superior. I expect you to keep yourselves as wet as possible and ready for my use at all times, but none of you cum without my participation and permission. Is that understood?"

This time, they're not quite in unison. Some say "Yes, sir!" again, some say "Yes, master!", but most of them are too busy furiously jilling off themselves and/or their neighbors to say much of anything. You have Mom lick Caitlin's face clean of your mixed fluids before pulling the two of them tight to either side of you.

"These two sluts will accompany me as I make the rounds to act as fluffers. If my dick wilts for even a second, I want you two to do whatever it takes to get me back to full mast."

"Yes, sir," your mom and your sister growl directly into your ears, grabbing your already re-inflating shaft and massaging it back to attention. You don't really expect to need much help keeping it up as you gorge yourself on this feast of flesh, but they do know the guest list better than you and can introduce any guests of theirs that you don't actually know. Plus, four extra hands could come in very useful.

"Now," you say, absently tweaking your attendants' nipples, "let's get this party started!"