"But you can't touch me there, Mike," she whimpered plaintively. "It's wrong..."

Her brother shrugged. "One way or the other, Sammy - you don't have a lot of choice."

"W-what do you mean?"

"Well, if you don't let me check then you forfeit the bet anyway." "Forfeit? I don't understand."

"Look, if you don't let me check then you lose the bet. So either I feel with my finger or..."

He stroked his still swollen cock, staring meaningfully between his sister's open thighs. Sammy trembled violently at the unspoken threat. She had no choice. She would have to allow him to touch her where nobody's hand but her own had ever been before. She closed her eyes tightly, squeezing a single tear from between her dark lashes.

"D-don't hurt me, Mike," she whispered as she felt his hand take hers and move it carefully from between her legs.

"You don't really think I'd do anything to hurt you, do you?"

Sammy shook her head but her eyes were full of apprehension.

"I know you won't hurt me," she whispered, "but this really is wrong. You shouldn't touch me there."

"Why, because mum said so?"

"Don't keep teasing me about that," complained Sammy. "Mum said it's wrong and you know that it must be - she wouldn't say it otherwise." Mike squeezed his little sister's hand gently as he moved it away from her legs. He was afraid to release his grip in case his sister's conscience got the better of her at the last moment and she decided to resist him.

"Of course mum's right," he said gently, his lips so close to Sammy's ear that she could feel his warm breath. "We both know that mum wants the best for both of us and she wants to keep you safe."

"So we shouldn't be doing this..."

Mike kissed her fleetingly on the cheek. It was an innocent kiss, intended to reassure the little girl.

"Mum wants to protect you from anything bad that might happen, Sammy. Letting men touch your pussy might lead to bad things but I'm your brother. You know that I'd never do anything bad to you."

Sammy could see the logic in that. Surely her mum had never intended her words of warning to apply to Mike.

"So does that mean that it's okay for you to touch me?" she said hesitantly.

"Of course it is," said Mike reassuringly. "It isn't as if I'm hurting you, is it? All I want to do is teach you the stuff you need to know about."

His hand moved to rest gently on his sister's thigh. The nervous young girl, trembled at the contact and Mike half expected her to stop him but she remained silent and unresisting. When he was sure that his sister was growing used to his hand on the warm softness of her thigh and that she had relaxed a little, he moved his hand carefully upwards. Despite a faint whimper of alarm that escaped her innocent lips, she did nothing to stop the gradual progress of his fingertips along the smooth skin of her trembling legs.

Despite his air of confidence, Mike's hand shook as his fingers neared the junction of Sammy's thighs. He stared into Sammy's face and watched her eyes for any sign of resistance as he moved his hand still higher and his fingers grazed the smooth plump lips of her hairless pussy. His sister stared sightlessly up at the clear sky, the only indication that she had felt him touch her vaginal lips was the sudden nervous clenching of her small hands.

Mike's penis throbbed wildly as he felt the bare flesh of her pussy for the first time. He struggled to control himself, knowing that he would certainly find what his sister had been unable to, and that she would lose the bet......(cont)