Tiffany

‘Tiffany, Dr Derrière will see you now.’

In walked a tiny 18-year old gymnast, brown hair slicked back in a bun, under five foot tall. She was cute as a button, everything about her was ultra-petite, nubile. She was wearing a red leotard and grey sweat pants. She sat on the edge of the seat, back straight.

‘Good morning Tiffany, what seems to be the problem?’

‘My coach keeps telling me to work on my core muscles,’ she said, putting her tummy, ‘then my performance might develop enough to get in the Olympic team. He says my abdominals need work, but I do everything he says and it doesn’t seem to work.’

‘Can you give me an example of an exercise he’s given you?’

She looked embarrassed for a second. ‘The one he says has the best results is to crunch your glute muscles in your butt whenever your standing and it makes you tense your abdominals. I try and do this all the time, hundreds a day. I’m getting ****, I’ll try anything.’

‘Mmm...ok. I may have some other suggestions that a gym coach might not think of, but let’s just check what happens physiologically when you’re doing the butt crunches, make sure you’ve got the right idea ok?’

She nodded, slightly unsure, and stood up. ‘Will I need to take any clothes off Doctor?’

‘I need to be able to see your abdominals and your glutes so yes. You’ll need to take your sweat pants and leotard off I would think.’

She swallowed hard. ‘Ok.’

She turned around and slipped off her chucks then pulled down her sweat pants, revealing a small, pert ass with a leotard wedged right up the crack. She used her fingers to release the leotard with a snap, and then took her arms out in a wriggling fashion and pulled the leotard down stepping out of it and placing it on the chair.

The doctor tried to ignore the tiny pink thong, and the fact she was now topless. She was flawless, not an ounce of spare flesh, a tight, solid teen. She turned to face him, shoulders back, her tiny A-cup breasts with their hard nipples standing proud. Below this her abdominal muscles were impressive - ripped perfection - a six pack of gorgeous tiny muscles.

He placed his right hand on her stomach, and stroked it, caressing right up to underneath her breasts and down to her thong, pretending to accidentally put a finger underneath the strap. She flinched. ‘Your abdominals are very impressive,’ he said. ‘Ok, turn around. That’s it, stand between my legs and face forwards. I’ll keep a hand on your abs, now flex and flex your glutes for me so I can see what happens.’

He watched, as the tiny girl’s ass cheeks tensed, an inch or so from his erection. Nothing happened to her glutes really but she did stand a little more upright each time. He watched for a few minutes transfixed. ‘Any observations Doctor?’ she asked.

‘I think it’s less to do with your abdominals and more to do with your posture. When you tense your ass you stand straighter. What you probably need to do is find a way of using your ass to affect your posture for longer periods of time.’

‘How would I do that?’

‘Have you ever inserted anything into your ass? Finger, plug, dildo, cock?’

‘Doctor!’ said Tiffany, shocked. She turned to face him and covered her breasts. ‘Are you serious?’

‘Medically there is nothing better for your posture than something up your ass. I’ll prove it if you like. Just slip your thong off and turn round. You did say you were ****.’

She thought about it for a few seconds. ‘Ok.’ She slipped the thong off, revealing a shaven pussy, then turned around. ‘I suspect you stand very slightly forward on the balls of your feet,’ he said once again holding her abs with an arm around her from behind. He pressed his erection into her leg. ‘I’m going to insert a finger up your anus, let’s just see what happens.’ He licked the index finger of his spare hand and then gently eased it into the tiny girl’s ass, just up to the first knuckle. She gasped, tensed her butt and her head and shoulders shot back.

‘You see, you’re standing much more upright now,’ he said. ‘Yes, yes!’ gasped the girl.

He pushed in a little further and she stood even further upright. He started fucking her asshole with his finger and her posture changed in sync with how deep his finger was in her rectum.

‘That’s amazing,’ she said, ‘but I can’t do gymnastics or competitions and trials with a finger up my butt can I?’

‘True, but there is other ways. You can wear butt plugs - we could experiment with various sizes; also I’m minded to prescribe a regular once or twice a week ass fuck using dildo or cock, whatever’s available - this might have long term benefits in changing your posture permanently. What would you like to do?’