Exeter, England
May 2027
The Exeter Mourning Gardens were what they were, a large garden. It didn't just have fields of plants, but also fields of graves. It was quiet, with the exception of the local English birds.
Not anymore.
There was a slight mechanical whine near the East Gate. A large black metal hand clamped onto a bar of the ornate gate and pulled back. The gate groaned and swung open, creaking. The whining came back as the figure slowly clomped into the yard, walking into the sunlight.
It was a tall armored bemoth of a fox, wearing an armor suit of Kevlar and Titanium. A helmet made out of the same material covered its face, with the exception of orange/yellow bangs, ears and a white protruding muzzle. Two tails snaked out from the back side. The machine fox started to quicken its pace, striding past rows of headstones. Finally, after two minutes, it stopped and turned.
The fox tilted its head down, and stared blankly at a large granite angel. It was made to exact proportions of the person that it marked. On the plate below, bore the legend of its occupant
"In Memoriam, Maria R. Robotnik. 2000-2016 - An angel taken away before her time."
The fox knelt down and reached out, touching the base. Then it abruptdly turned into its flesh self, wearing a dark gray dress jacket, a white button-up shirt and a gray tie. Innocent blue-gray eyes continued to stare down. The fox then opened its mouth and spoke in a calm, but deep voice.
"Goodbye baby."
The fox, Miles "Tails" Prower, then looked left and then right. He raised himself up and turned away, his old appearence fading away, back to the armored cyborg fox that he was now. Tails slowly walked away, a distant sob trapped in his metal chest.
In terms of style you appear to have the makings of a good writer: your grammar is sound, your descriptions are vivid and you pace the story quite well. Furthermore, the content of the piece works well as an prologue, introducing succinctly one of the (presumably) key players in your plot and one important in the backstory.
However, I have a few minor stylistic criticisms. I would have used a colon rather than a comma before "a large garden". The comma tends to separate list items and sub-clauses or delimit parenthesis, none of which really encompasses the descriptive phrase "a large garden". I'm not an expert grammarian though, so take my advice with a pinch of salt.
"Behemoth", not "bemoth". I also think "armoured suit" sounds better than "armour suit". Kevlar, being a brand name, should be capitalised, but titanium is a common noun shouldn't be: you wouldn't capitalise iron or gold, would you?
Combining adjectives with a stroke as in "orange/yellow" is poor form in prose. It would be better to say something like "orangey-yellow" or a "yellowish shade of orange", I reckon.
There's no d in abruptly.
You seem to overuse the word "then" a tad, a particularly striking example is the phrase "then looked left and then right". It's not entirely redundant but sounds clumsy, removing either one of them (preferably the first) would convey the same meaning while sounding a lot better.
Finally, the word "now" in the last paragraph should be replaced with something like "before" or "previously": as it stands the implication is that Tails is in this cyborg form when he decides to turn into his cyborg form, which is contradictory and nonsensical.
Other than that, it's nice little bit of prose. Good work.