Taehyung barely hears the instruction for all the noise his heart is making in his ears, blood is hissing and pulsing all over his body, it feels like his whole being is barely contained with all the desperate need that has been accumulating over weeks, months, years.

Dutifully, he opens his mouth, wondering how the moan that was so desperate to escape, manages to stay in.

Waiting has been the hardest part.

Watching the gloved hands contain him, tightening the straps, while the shiny equipment simply waits... Taehyung can't help but to wonder what goes on behind those dark eyes that seem so self-contained, so closed-off behind the glasses. Jungkook never says a lot – but even that, the fact that Taehyung is forced to stay out, kind of turns him on. Because he doesn't know, he's mentally powerless, just as powerless as the straps now make him, physically.

He swallows awkwardly, still holding his mouth open, simply waiting, like a baby bird for a morsel of food.

Finally, Jungkook moves, but rather than grab a tool, he simply reaches for Taehyung's mouth with his gloved hand. A tentative finger travels over the soft cushion of the lower lip, from one corner to another, while Taehyung stares at his dentist, who is staring at his mouth with an intense look in his glossy eyes behind the glint of the glasses.

When the finger pushes inside the mouth, pulling the side wider, Taehyung can't hide the breathy gasp. Another finger, even more confident than the first, pushes along the bottom row of his teeth, along the gum line, while the alert eyes observe over the white mask.

"Your gums seem healthy, it's good to see you practice as you preach, Dr Kim. Excellent oral hygiene," Jungkook says.

The word "oral" instantly sends filthy thoughts circling around in Taehyung's already messed up head, he's too vulnerable by the time a few fingers push in properly and slide easily over his tongue, all the way to the back of his mouth. A fierce blush flashes across his face when a helpless, soft gasp of a moan tickles against the fingers.

"Tongue too, healthy colour..." Jungkook carries on as if it's normal for a dentist to be literally so hands on – Taehyung has never seen Dr Jeon touch a patient with anything other than the appropriate tools – the thought has him trembling in the chair, why is the man making such an exception for him? An inkling of hope flickers...

There is saliva building up in Taehyung's throat, with the strong urge tickling at him to swallow it down, but Jungkook delays, keeping the fingers lodged inside him. He pushes several digits practically down Taehyung's throat and there is nothing he can do about it. There is nothing he wants to do about it.

"Your gag reflex is very minimal, Dr Kim, I hope you haven't had any issues with that?" The neutral tone comments very dispassionately.

Taehyung shakes his head, eyes rolling at the fingers nudging against the back of his throat while his head helpfully provides the imagery to the reason why his gag reflex is so minimal – it's well-trained out of him with the aid of many a sex toy on a lonely night... As if he'd ever admit that!

Taehyung's mouth feels empty when the fingers pull out with a string of saliva still clinging onto them.

"Lift your tongue?" Jungkook looks around in the mouth, under the tongue and Taehyung feels like he's slowly disintegrating – in the best way possible. "I thought for a second that you might have a tongue tie, but it looks good, push your tongue out, as far as it goes... Oh, impressive," Jungkook says, but it doesn't really sound like a compliment, it's more dismissive than that and the tone makes Taehyung want to do better, somehow. "Have you had your tonsils removed?"

Taehyung swallows and clears his throat.

"Yes, when I was a child, I had issues with ear infections..." he replies, all the while wondering when they're going to get to his teeth... The fact that he can do very little about Dr Jeon's choice of treatment is truly beginning to dawn on him. He is tied down, totally helpless...

Jungkook could do anything, anything at all... Oh lord. Damp carries on soaking the front of his pants when Taehyung's cock weeps of joy at the thought.

"Oh, that reminds me..." Suddenly, Jungkook pushes away on his little stool, disappearing somewhere behind the treatment chair. There are drawers being opened, metal clicking on metal.

Taehyung is beginning to wonder if he is going to make it, his cock is aching so hard in his pants and Dr Jeon just keeps on delaying.

"I can't recall if I mentioned it before but I came across some vintage dental equipment in a yard sale some weeks back and I bought them in the hopes of making a little exhibition around the waiting area..." Jungkook speaks from behind the chair. "They look pretty good after a nice clean."

Taehyung is running out of patience. "That sounds like a great idea, but–"

Jungkook reappears with an old metal contraption in his gloved hands. He holds it under the light, right in Taehyung's face. It looks very much like some of the equipment already in Dr Jeon's more surgically oriented treatment room – except this implement is clearly very old.

Taehyung would recognise the scissors-shape with bent ends anywhere: The Molt Mouth Gag. It is designed to hold the mouth permanently open by latching between the top and bottom teeth on one side of the mouth, like permanently open scissors that hook over the teeth with an adjustable locking mechanism.

To Taehyung's utter embarrassment, his reaction is instantaneous: his mouth drops open in invitation, even though Dr Jeon hasn't shown any indication that he was even going to use it.

That damned, questioning brow rises again above the metal rim of the glasses and it feels like the tiny movement is judging Taehyung from head to toe. To his horror, his obstinate mouth stays open, asking... offering.