She's a freak

She steps out of the room and returns with a small wheeled shop vac. She then picks out a nozzle for the vacuum and attaches it.

She brings it forward to attach the nozzle to your fully erect dick, but to no avail. The nozzle opening is too small.
She takes out some vaseline jelly-like substance and lubes the inside of the nozzle. She brings it forward as it then slides down over your erect dick. She flips it on.

The vacuum starts sucking, you feel your dick stretching and being pulled into a tight seal inside the vacuum nozzle.