It's in his penis, specifically.

John glanced between his little sister and the doctor, realising there was no way to avoid the truth now. 'It's... it's in my penis. Specifically.'

'Okay,' the doctor replied, while Louise suppressed a girlish giggle. 'Let's take a look, then.'

There was no way out of this now, he realised, wondering how he had thought bringing Louise in with him had been a good idea. At least the doctor didn't know they were actually siblings.

Ignoring his little sister with all his might, he slowly unbuckled his belt, keeping his eyes on the ceiling, and unbuttoned his pants, pulling them down his legs, carefully over the problem area, until they were on the floor around his ankles. His underwear was the only layer between his naked crotch and the two women in the room, and he inhaled deeply before removing those, too.

With his manhood exposed to the cool air of the room, John brought his eyes back down from above him to identify the situation. The doctor was nodding, looking at the region in question, while, sure enough, Louise was barely able to keep her lips sealed as laughter threatened to escape them.

'Mind if I take a closer look, John?' Doctor Harper asked. He nodded and she rolled forward on her office chair.

John glared at Louise as she pointed and held a hand over her mouth, removing it to mouth the words, 'nice dick'. He shook his head, hoping the flush in his cheeks wasn't as obvious as it felt.

The touch of the doctor's gloved fingertips sent a jolt through him he hadn't expected. He looked down to see her carefully examining his shaft, lifting it above his testicles and prodding different areas. To say he felt awkward standing in the middle of her office, her fingers gently probing his member, his little sister only a metre or so away laughing at the situation, was a severe understatement.

But it was hard to ignore the doctor's careful touch, despite her professionalism.