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(Warning! Spoilers! Shipping!) The two different universes collide. (So that you know, the only MyStreet characters will be Aaron, Aph, and Zane.) Also, this will be before Katelyn, Travis, or Kawaii~Chan were known to be on the island by Aph. Also, after season 2 but before season 3 and also, Laurence is still there. (Aphmau=MyStreet, Lady Aphmau=MCD (unless it's in MyStreet Aph's POV). The other two are dead in MCD) (Mostly in MyStreet Aph's POV)
Edit: (I started this story before MyStreet S6 E10)