Might as well get Louise as embarrassed as he is.

John met his little sister's eyes and thought about her threats and her teenage intentions to make him feel more awkward than he already did, and formed a plan in his mind, saying it as quickly as it came to him. 'Louise,' he said, never leaving her eyes. 'Would you please give... your boyfriend, a hand?'

Louise's expression turned grave as she realised what he had done. With a simple request, he'd ensured that he'd won the situation. If she refused, she would leave the room and John would be left alone with the doctor to continue the examination. If she told the doctor the truth about their relationship, she was likely to be in as much trouble as John considering how she'd gone alone with the story. There was no way she could face the other option... to accept.

Unless...

'Oh, John, of course I can help. That's why I came here with you, isn't it?'

It was John's turn for his face to drain of all color with realisation. He hadn't expected her to actually go along with his suggestion. Did she even realise what she was agreeing to? Before he could complain, she took another step towards him, her body almost pressed against him.

'Alright then,' Doctor Harper interjected. 'If you can get John to erection, Louise, that would be great.'

Louise nodded as the doctor rolled slightly away, leaving John and his little sister standing in the middle of the room, his member hanging in the air. There was barely a moment of hesitation on Louise's part before her hand found its way to her brother's groin.

The shock on his face must have been obvious, because Louise laughed again, a high, girly giggle. This time she didn't seem to care if the doctor noticed.

John simply stood frozen, unsure if this was actually happening. His little sister's hands were soft, warm, as her grip moved around his penis, massaging the shaft in various points. As disgusted as he was with the situation, and himself; after all, this had been his grand idea, he felt rushes of blood moving to his groin, and before long, under his little sister's guiding hand, his shaft was growing thicker, longer and beginning to stand.

Louise put her free hand on the back of his neck and pulled their faces close together, until her chin was resting on his shoulder. 'Is this what you wanted, big brother?' she whispered in his ear. 'Your little sister getting your dick hard?'

John swallowed, his mouth and throat dry. 'What the hell are you doing, Louise?' he whispered back, trying to ignore her hand now moving up and down his shaft and the waves of pleasure each pump brought. 'You weren't supposed to go along with his. You should've just left.'

'You should know by now you can't beat me, John. In an argument, or in some kind of weird mind game. Besides, you don't seem to be as uncomfortable as you say you are.'

They both looked down to see his penis now standing at full attention between them, her hand firmly gripped beneath the head.

'Good job, John,' Louise said, her voice mockingly exaggerated. 'I knew you could do it, sweetie.' Louise winked, her intention to further mock him, but John found it embarrassingly difficult to ignore how sexy the gesture had looked.

'Good job, indeed,' Doctor Harper chimed in from her chair. 'Now, John, is there still pain present? This is very important.'