apgriezts pulksteņrādītājs

Today is one boys birthday. Today is also the day when he and his girlfriend will find a mysterious pocket watch in the woods. The two don't know there being watched by one alien who owns that pocket watch and has powers to teleport people into the past and future and pause and resume time and go back in time or into different time lines
The boy and his girlfriend know that it's the end of the world but they both survive and are thrusted into a time warping adventure

Inspiration Homestuck
(This is kinda a au? I guess )