Lupo's Encounter (Patreon)

Where is this place? What is this place? An ominous, featureless crimson sky, and a sea of churning goo as far as you can see...

Needless to say it didn't take the writhing mass much time to make its way to where Lupo stood. It made quick work, throwing them onto their back and finding its way into every crack and oriface of their form.
As it probed deeper, they felt their muscles start to tighten and expand. Lupo's shaft grew, swelling and throbbing inch after inch as more and more of the goo like substance entered them.
They felt it invade and spread, their body being wracked with pleasure and their mind being overpowered by a lustful need for more.

A commission for @Lewdlupo over on Twitter!