I looked at the shiny black dildo. Grinning, Doctor Jones pumped it up...and up...and up. It was huge. "Don't worry - we won't be inflating it to maximum," he reassured me. I sighed with relief.

Once again, my hiney-hole was probed by his fingers. "Hmm. Doctor Fields, could I get a syringe of lubricant?"

Finally, the first doctor had a name. He brought over a syringe filled with clear gel. "This is very thick, so your anus and rectum will stay nice and wet and slick, and things will slide in and out of you easily," he explained. I felt the tip push into my hiney-hole, and then a strange, cool feeling as they filled me with the gel.

Doctor Jones pumped the dildo up a bit, and put the tip against my hiney-hole. I gasped; it was so smooth, and the biggest thing that had touched me so far. He pressed gently, and I felt my hiney-hole open a little. "Doctor MacKenzie? Can you begin masturbating her again?"

"With pleasure," Doctor MacKenzie replied. He was facing me this time; he put a finger and thumb to either side of my clit and stroked slowly. "I know this is different, but you can't be allowed to orgasm until more of the inflatable is inside your anus," he said.

"Yes, Doctor," I gasped, because he was close to making me come anyway. I felt the big dildo push against and into my hiney-hole a little more. "The head's inside you now," Doctor Jones said. "I'll insert it to the same length as your Daddy's penis, and then we'll blow it up a bit more, and then you can orgasm."

All I could do was whimper. The dildo slid slowly, smoothly into me, then stopped. Doctor MacKenzie kept stroking my clit, and nobody told me to stop moving my hips in time with his hand, so I didn't. The dildo started to inflate, and just before it started to hurt, Doctor Jones somehow knew and told Doctor MacKenzie to let me come. He did, suddenly stroking me the way I liked best again, one fingertip on my clit, right on the head. When I caught my breath, I wondered just how much more there could be. Nothing hurt or was sore, but I didn't know how many more times I could come without passing out or falling asleep.

"One more inflation, Mr. Black, and then we'll see if you can't penetrate," Doctor Jones told Daddy. Daddy nodded, and started taking his clothes off again.

Doctor MacKenzie only touched my clit every now and then, and I whined. "No more orgasms, young lady," he said sternly. "Not until your Daddy has penetrated your anus fully, at any rate. Now relax."

"Yes, just relax and let your anus stretch," Doctor Jones urged as he blew the dildo up even bigger. "There. We'll leave our patient for just a moment to adjust," he said. They were all staring at the sight of my wet hiney-hole stretched around the big, black thing inside it. I whined and begged to be allowed to come again, but they just grinned. After a few minutes, Doctor Jones deflated the dildo and eased it out of me. Doctor Fields and Daddy came up to the table.

"Your Daddy is ready to penetrate you anally," Doctor Fields said softly. "Are you ready?"

"Oh, god, yes, Daddy, please, please put it in me," I begged. Daddy smiled.

"Excellent," Doctor Fields said. "I'll be telling you everything that's happening," he told me. "Your Daddy will now stimulate your anus with the head of his penis...There, your anus is already relaxed and opening to him." I moaned. It felt so good, so wet and dirty, and I wanted more. "Yes, it feels good, doesn't it? Now he's going to slowly slide all of it inside you, fully penetrating your anus and rectum...I'll masturbate you again to be sure you keep enjoying this," he said as his finger circled my clit delicately. I was moaning and making noises I couldn't control as Daddy slid home deep inside my hiney-hole. He stopped once he was all the way in.

"Are you ready for your Daddy to have anal intercourse with you? Are you ready for him to pump in and out of your anus until he has an orgasm? When you are, please tell him, and he'll begin," Doctor Fields said.

I pulled my head up to look at Daddy. "Please, Daddy. Please fuck my hiney-hole and come inside it. Please."

"Yes, little girl, yes..." Daddy groaned, slowly pulling his cock out of me, then just as carefully pushing it back in. I knew it was naughty, but I pumped myself towards him, desperate to come. The feeling of his cock stroking the inside of my hiney-hole was irresistable, and Doctor Fields was working my clit just right. But then Daddy came, and everything stopped. I burst into tears.

"It's OK, baby. You're going to come soon, I promise."

"Daddy, please..."

He stroked my hair, and that's when I realized the doctors were naked - and putting on condoms. "They have to check to make sure you're OK inside, baby, and there's only one way to do that."

I was horrified again. "They're...they're all going to put it in my hiney-hole?"

Daddy smiled. "Yes. Every single doctor is going to put his cock up your sweet little hole and fuck you. Don't tell me you don't want it."

I closed my eyes. How did Daddy always know the things I couldn't admit? "Yes, Daddy."

Doctor MacKenzie was first. He spent a lot of time rubbing my hiney-hole with the tip of his cock, and worked it into me with a circular motion. Once he was all the way in, he asked me how my hiney-hole felt.

"It feels good," I said, lamely.

He nodded, patted my thigh, and pulled his cock back out of me. "Next," he said, and Doctor Jones stepped up.

I'd sneaked a peek, and Doctor Jones's cock was, while shorter, a little thicker than Daddy's. I was a little bit scared, even after all this. He showed me the lube he was stroking onto his cock. "I'll be very slow and gentle," he said. "Would you like me to masturbate you?"

"Please, Doctor," I said as he eased the big cockhead into my hiney-hole. I gasped as I stretched open for him. He stroked in and out of me slowly, a finger working my clit. Just as I started to come, he stopped. I cried again. Weren't they ever going to let me come?

Doctor Fields patted my leg kindly. "I know, you're very frustrated. But we're going to do one last special exam," he said. Daddy was grinning again. Uh-oh. "Same as the other time, young lady," he said as they pulled me off the table and Daddy took my place. I obediently put Daddy's cock up my pussy and leaned forward, but Daddy stopped me from laying on him again. "I need to be able to get to your clit," he told me. I relaxed as Daddy started rubbing it with his thumb, but when Doctor Fields spoke again, I tensed up despite myself.

"Now I'll be penetrating your anus and rectum while your Daddy penetrates you vaginally," he said. I squeaked a protest before I could stop myself.

"Shhh...Just relax," the doctor said. "Does this feel good? What am I doing to you? Describe it."

"You're rubbing the head of your cock against my hiney-hole," I said. Daddy rubbed my clit a little faster.

"Yes," Doctor Fields said. He pushed the head in, making me gasp. He waited a second or two, then pushed what felt like half his cock into my hiney-hole. "And now?" he asked?

"I think you've...you've got half your cock up my hiney-hole," I managed. This earned me a little more pressure on my clit, and a little more cock up my hole. I started humping Daddy's cock. "No, no, no, none of that," Doctor Fields said as Daddy held my hips still. More cock inside me, and then just stillness. "Describe it to us," the doctor demanded.

"I'm so full," I groaned.

"Of?" he prompted.

"My hiney-hole and my pussy are so full of cock...It feels so good..."

"Good," he said. "I'm going to start stroking my penis in and out of your anus now. It will rub against your Daddy's penis, and the tightness will feel very good to us. I will not stop until your Daddy and I reach orgasm. Do you understand?"

I knew what they wanted by this point. "Uh-huh...You're going to fuck my hiney-hole until you both come inside me. Please. Can I come? Please?"

Doctor Fields chuckled. "I doubt you'll be able to stop," he said, and moved.

My hiney-hole was so full of lube that the pumping was silky-smooth, even as tight as it was with the two cocks in me. I could feel the doctor's cock sliding against Daddy's inside me. I started babbling, even using the big-girl words that usually got me spanked. "Oh god, yes, fuck my asshole," I pled. "I can feel Daddy's cock, I can feel you both in my holes, oh fuck please let me come!"

Daddy came then, pumping my pussy a little. He kept rubbing my clit. "C'mon, little girl. Come for Daddy and Doctor Fields. Make Doctor Fields's cock feel good, because he's going to keep fucking your ass until he comes," he reminded me.

The doctor was pumping my hiney-hole fast and hard now. "Contract your muscles," he ordered. "Squeeze my penis. Yes...harder..." he moved in a circles again, churning his cock in my hiney-hole. It stretched me just a little more, and I came again. Doctor Fields groaned, shoved his cock all they way in me, and came.

I must have fallen asleep or passed out, because they next thing I knew, I was on the table again, covered with a blanket. Doctor Fields and Daddy were the only ones left in the room. "I think you'll have no more problems," Doctor Fields was saying. He was explaining to Daddy how to keep my hiney-hole open, but I wasn't really paying attention. Well, not until I heard him ask Daddy a question...

"She's an exceptional patient," Doctor Fields said. "Do you suppose you could bring her back next week as a demonstration exam subject? I've got ten new interns...