It's not going in you

"It's not going inside you, your going inside it." Your mother explained.

"What!" You gasped. You looked up at the huge cock towering above you. Your mother shifted her head to point the tip towards you. The urethra hole was small but seemed flexible. You were a little bit disgusted and slightly aroused, your vagina growing moist. "That's disgusting mum, what could we possibly learn from this experiment?"

"XD105 is supposed to increase my body's ability to stretch, I wanted to see how it interacts with XD004 along with the cocktail that is within you." Your mother explained. "Now let's get started." She remarked and using one finger pushed your head into the cock of your head.

The smell was strong, a mix of urine and musk, she must have gone to the loo before waking you up this morning. You felt your mother's finger moving from the back of your head, now that it was inside her cock; which was stretching open wide. You guess the concoctions mixed just as expected. You felt your mother's fingers in a new place. One hand grasped around her cock, squeezing you tightly and begin to pump it at a steady pace. Her other hands reached down and began to play with your shrunken genitals. Her index finger and thumb began rubbing your cock between them. Her pinkie finger rubs over your pussy, sliding along your clit and labia. This probing also pushes you deeper.

You are coated in a layer of moisture from the inside of your mother's cock as you are pushed down the shaft. You feel pressure building up from your mother probing your folds. You moan in pleasure as you squirt onto your mother's finger. You feel your mother's cock slip over your feet as you recover from your orgasm. Your cock is still hard and you feel a second orgasm building in your balls as you slide down the shaft. You cum from your cock as you reach the end of the shaft.