A few days ago.

John ignored Louise as he answered. 'It's, uh, been a few days.'

'Really?' Doctor Harper asked, looking up at him while still examining his penis.

'Yeah. I think so. With my girlfriend,' he stammered, trying to ignore her probing

'Yes, doctor,’ Louise finally spoke up, and came around to the doctor’s side, likely just to be closer to her brother’s naked groin. ‘It has been a few days, but I just want to be clear that to go for so long without...’ she glanced at her brother's naked crotch for a moment, stifling whatever feeling was arousing in her. 'It's not exactly normal, for us.' Before John could clarify his real relationship with Louise, his little sister grabbed his hand.

He almost flinched at her touch, considering the situation. Sitting on the table with the doctor's gloved fingertips softly examining his manhood, his naked groin exposed to the cool air, and now Louise grabbing his hand and squeezing harder than was necessary; it was enough to send a rush of blood to his manhood. He quickly pulled his hand away from Louise's grip, but she continued unperturbed.

'He's just a little embarrassed,' she whispered to the doctor, though he could obviously hear her too. 'John, you don't need to worry.' She stepped forward another step to gently place her hand back onto his. 'We can share any details about our sex life with the doctor. It's her job.' Louise winked when she knew the doctor wasn't looking.

'Uh,' John stammered, trying to change the subject as he felt more blood moving through his body to the only place he couldn't bare. 'What might be the problem?' he asked, looking away from his little sister, her expression dangerously seductive.

Doctor Harper gave one more quick peak before finally releasing his genitals from her grip. 'Well,' she began, standing back up and removing her gloves. 'I have an idea, but I'm not sure how accurate it could be. There's no sign of disease or infection, so it's likely that whatever is causing this discomfort is coming from inside. Considering that, I think we should perform a few routine tests, to see what else we can find out.'

'Tests?' he asked.

'What sort of tests?' Louise asked, her hand still on his. Her grip tightened only slightly, as if excited for the doctor's response.

'I think we should start, and only if you are both comfortable with doing so, by seeing if John can still achieve an erection.’

His jaw dropped at the doctor's suggestion, before he turned to Louise in fear, expecting the worst from her reaction. Instead, his little sister was beaming with excitement.

‘I think we’re both okay with that, doc,’ Louise answered, looking straight back to her brother's naked groin.

‘John?’ the doctor asked.