You hide under the bed

You grab your towel and roll under Emilys bed, where you luckily had enough space, the sheets of the bed hopefully covering you up just enough.
Through the gap between the floor and the sheet, you see the side of her room featuring the door, and herr mirror.

Then the door opens, and closes again after a moment. "Strange," you hear Emily say "I thought I had closed the door...ahh, doesnt matter."

A moment later, you see her feet moving as she faces the mirror. Then you see her sports bra fall to the ground. Your hand wanders back to your dick as you realize that Emily is now half-naked, only a couple feet away from you. Then her pants followed.
You were so close to this beautiful girl, completely undressed, but you couldnt see a thing. Then her feet move again, now towards the bed. You try your best not to make any noise, as you see her bending down. Her hands miss you by a couple inches, as she searches something under the bed, which she then finds- the metall box.
She opens the box, and, by the sound of it, takes out a few things, before laying down on her bed.

You then hear her attaching something, her legs as you follow, at the two hooks on two cornes of the bed. After that, a soft moan escapes her lips and something starts to hum, she must have turned the vibrator on and positioned it against her pussy.
Lastly, you hear the snapping of handcuffs closing around her hands.
Your jerk off faster as you imagine Emily laying there, inches away, completely naked and tied up, her body squirming under the vibrations of her toy.

Then something happenes you didn't expect. She moans your name.

"Ethan.. Master," she says. You feel your dick quiver in your hand as she continues. "I'm sorry... I was a bad girl... but I couldn't contain myself, my desire to see you in the shower, naked, hard, was just too big."

You halted. Could it really be? Did Emily walk in on you on purpose?

"Please punish me," Emily whisperes, and the vibrator's noise grew louder, "Fuck me with your big cock, so no one else will ever feel anything again when he wants to fuck my pussy. Stretch me with your dick Ethan, while I am tied up , helpless, at your mercy."

You go faster, you cant believe what you´re hearing.

Meanwhile, Emily gets louder. "Yes!" she cries, "Fuck your **** with your monster dick, penetrate me deeper than anyone else can, take control of me, submit me!"

You feel yourself getting close, and Emily seemed to be approaching her climax as well-

"Fill me," she cries, judging of the sound of her voice in pure ecstacy. "Shoot your cum into me Ethan, give your **** what she deserves."

And while Emily came shaking, you also came again, shooting your sperm into the nextbest thing, your towel.
For a couple of minutes both of you catch your breath.

After a while, Emily seemed to have calmed down, and she freed herself and stood up. Emily picked up some clothes from the floor, then left the room, probably to shower.
You wait for a couple of seconds then you too get up, and quickly leave Emilys room. Emily seemed to have taken the smaller bathroom, which leaves you too escape into the large one.
Catching your breath, you finally shower and start your day.