"Tell me how inferior you are."

Emily's eyes look at you with concern, then delight, then confusion. "...what?"

God, she really is dumb. "What I'm saying is, there is someone in this room who is worthy of sucking my cock." you say as you start to undo your pants.

Your sister glares down at your crotch, waiting for your member to make an appearance.

"Do you know who that might be?" You ask, dropping your pants and quickly pulling it out.

"Oh god...." Emily is completely helpless in its presence. "I mean... who?"

You step toward here. She goes to grab it, her eyes lighting up, her lips parting, as if she's waiting her whole life for this, and you fling it away. "My girl Carrie, that's who."Carrie smiles at you, steps forward and slowly drops to her knees. "Now tell me why she deserves it, and not a dumb slut like you."

And your bimbo sister begins to explain as she watches your girlfriend take your cock into her wet mouth.

"She's beautiful..." her voice trembles.

"Uh huh"

"Her... tits are amazing... they're so big." Emily is clearly pained watching Carrie slide your shaft deep into her throat.

"And she's the best cocksucker I've ever met. The best." You add.

"The best." Emily says. "No one is better."

"I think maybe I could live happy even if no one else ever sucked my cock." you say. "Other sluts think they know what they're doing. But they're just..." You try to find the word.

Carrie helps as she slips her lips off your throbbing hot member, saliva stretching from your flesh to her mouth. "...worthless?" she adds.

"Yeah." You say. "Don't you think?"

"Yes..." Emily's teeth are gritted now. It's noticeably difficult for her to speak. "Other...sluts are... just... you don't need them.... they need you."

"Tell me something?" You say to your sis as Carrie slips you inside her throat again. "Would you rather be doing anything else with your mouth right now?"

"Y... maybe.... yes. I don't know." You've never seen your sister like this. Ever.

"Well then figure it out, you dumb cunt." You wonder for a moment if that's too mean. But Carrie's eyes glance up at you with lust, and you decide nothing is too mean.

And predictably a few seconds later, you feel smooth hands spread your ass cheeks and a tongue begin to stroke your hole. It's very wet. It's very pleasant.

You look down at Carrie. "Can you imagine a slut so dumb she'd be reduced to ass-licker for her entire life?"

"I don't know. Hard to imagine anyone with that little self respect." Carrie answers, licking the strands of your precum off her lips.

"How about you, sis?" You ask.

You hear Emily's voice come up for breath. "...maybe."

And you fling your body around 180 degrees, your cock slipping away from Carrie's tongue and smacking your sister right in the face. She falls backward onto her ass intensely.

"Oh god! Oh god! Oh god!" she repeats to herself, then adding "it touched me"

You squat down so your face is near hers. You still see the girl you grew up with in her eyes. It's amazing really. "Have you always been this big of a slut, and I just missed it?"

"I... don't know." Emily answers.

"Did you ever fuck any of my friends growing up?" You ask.

"No."

"Did you ever fuck any of your own friends?"

"Yes... Mabel and Nancy."

You remember Mabel and Nancy. Your mind flips on a visual of that... nice.

"Did you ever fuck any teachers?" You continue your interrogation.

"Yes... Mr. Willberg."

"Mr. Willberg?" You ask. "he was an asshole... and fat."

"Yes." Emily looks up at you with big pathetic eyes. "But I needed to pass Chemistry."

"What about that teacher whose house you were always going over. What was her name?"

"Miss Goodrich? No... I didn't"

"Why were you always over there anyway?" You ask.

"She was... mentoring me."

"Is that what you were calling it?" You reach over and squeeze your sister's plump tit... hard.

"She...was" her eyes almost roll back into her head. "she thought I could be... a world class... flutist."

You laugh "Even your mentor knew that your greatest aspiration in life was to blow things."

"Psssst" Carrie is calling to you. You turn. She motions you over. And she whispers a suggestion to you. Something so wicked you can't not do it. This is why you keep your nasty girlfriend around, you think .