Jeff was looking though the many different options, enthralled by the variety, until he stopped on one of them.
The possibilities it had made his cock harden almost instantly.
He clicked on the 'Relationships' option, while reaching for his dick with the left hand, slowly beginning to stroke it.
It was exactly what he hoped for.
The option allowed the user to alter the relationships between anyone and anything.
He selected himself and began scolling through the menus that opened up.
"Family, friends... predator? Prey? Wait, let's ignore those for now."
He didn't find the option he was looking for and started again from the top.
"It's probably close to the start... there it is!" Jeff selected the 'Significant other' option, opening up yet another menu.
"Let's see, can you really- holy shit." He discovered that it was even possible to select the chair he was sitting on.
Jeff noticed that there was an option to drag and drop images, causing him to immediately look online for pictures of Donkeys,
his left had speeding up at the thought of what he was about to do.
He stopped when he found a particularly large and heavy looking one, his eyes drawn to the big Dokey dick dangling below.
Jeff saved the picture, before dragging it to the slot, opening up the Donkey's data after a short while.
His lust addled mind started coming up with more and more ideas, after Jeff had selected the Donkey as his significant other.
He set it so that no one would find his equine lover unusual, in addition to making public sex acceptable for them.
The thought that others would not even bat an eye at his 13 year old self being plowed by a Donkey in the middle of the street,
made Jeff's stroking turn into forceful jerking.
He changed a few more settings, making sure to select 'Permanent' on the timer, and finally got to the end.
The last section was for the Donkey himself.
As he scrolled through the options, Jeff noticed one in particular named 'Anthropomorphize'.
He looked at the explanation and discovered that he could turn the Donkey humanoid.
Jeff hesitated, seriously considering this option.
It would significantly increase their range of interactions, but would also take away from the thrill.
His jerking reached a frenzy, as Jeff imagined both options.
The anthro could be more dominant, having the hands needed to manhandle Jeff.
He could possessively hug Jeff with his large, furry arms, or treat him like a fucktoy, coming into his room whenever he wanted,
potentially even using the Chronivac on Jeff.
The feral version on the other hand would involve Jeff being actively submissive to the Donkey.
He could even give himself an intense desire to service the animal, anytime it wanted him to do so.
And what turned him on most, was that others would see him together with it and possibly even watch him get fucked by it.
Jeff made his choice and clicked the 'FINALIZE' button, just as he felt that he was about to climax.