[NSFW] Office Lady Working Overtime

It's late and everyone else is leaving the office, you've been working your ass off all day and need to catch some breath and blow off some steam. That's when your boss approaches you and tells you he has a special task just for you. He says a new asset arrived today and he wants you to check if it works correctly. Knowing perfectly where this is going, you start undressing.
Using his new metal frame he puts you easily into submission, it's not long until you can't move an inch. You're locked up, gagged, stuffed and exposed on you desk, like some kind of human trophy or the company's new mascot.
Your boss shows his excitement by slapping your ass until it becomes red, a sensation you've become quite accustomed to by now. Seeing your composure while enduring one hit after the other, he decides to promote you: he takes your badge, puts a nice "thot" stamp on it and clamps it to your nipple. You can feel a sharp pain coming from your small breast but its bearable, after all you're gonna get released soon, right?
As if he was reading your mind, your boss starts picking up his coat and whishes you good luck, since he's going to leave you like that for the night. You can't even start moaning to complain before he caresses your head gently and says he trusts you won't fail him. Hearing these words gives you courage as he locks he door behind him.
It's just at that moment that you realize: the papers you've been working on all day are just under your drooling mouth!
You know you can't stop yourself from ruining them your bodily fluids, you can only accept your punishment once your boss will find out. It's gonna be a long night of work and tomorrow will be an even longer day.

It's been a long time since I first sketched this artwork but I managed to actually finish it instead of forgetting about it like I usually do with my sketches.
I chose to keep it in greyscale to have some kind of noir vibes but I couldn't help it and ended up making a variant with a drop if red. what do you guys think?