Is this a sequel to something?

It's part of a series of films,yes. But can be watched as a stand-alone. But if you are really interested :
Starts with:
-What Time Is It There?
-The Skybridge is Gone (Short)
-Then this.

ANd the link?
The Characters.
And the explanation why (Spoilers ahead..................)

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is the male character turns from a watch seller to a porn actor...(the short film shows his audition and his feature explains in one word)