She uses your natural lubrication! (Practical)

"Subject is struggling accommodating the phallus substitute, but exhibits excess arousal secretions," the technician calmly dictates to the audiofile.

You bite your lip apprehensively and helplessly ride out the unavoidable vibrations within your clit. The pressure against your fleshy entrance ring ceases as she removes the phallus and begins sliding it up and down the crack of your ass. She expertly coats the rubber dildo with you fluids.

"I think we can get you to express some more," the girl says to herself.

She causes an explosion of sensation by pressing the side of the phallus directly against you exposed clit. The buzzing sound is muffled but the intensity of the internal mechanism increases under the pressure causing you to moan. It is sooo intense!

You cum again! More warm fluid erupts out of your tight pussy and stream down the crack of your ass.

"There we go!" she says satisfied with herself and resumes coating the dildo with your arousal, "Time to relax!"

You whimper again and strengthen your grip the restraints locking your wrists above your head. She spreads you pussy lips as far as she can and presses the head of the dildo against your entrance.

The pressure builds!

She repositions her grip and leans into you.

The pressure builds!

She slowly twists the phallus and you feel your vaginal entrance begin to yield.

"Aaaaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhhhhhhhhhhh!" you scream out as you cum harder than you ever have in your entire life.

Pop!

She topples forward as the shaft breaches your vaginal ring! Success! She steps back and admires her work. The long shaft projects from your little love hole. It throbs with each of your powerful contractions. You wail at the ceiling as you endure your powerful muscles clamping around the girth of the intruding phallus.

As you come down from your orgasm she grips the phallus again. "We aren't done yet," she warns.