Lucky's Bricks

What happens when "What happens here stays here" turns into a constant reminder?

A last hurrah before 'adulting" Toni and Drew hook up on a week long vacation in Cancun and spend a week of hedonistic fun.
The last night of vacation, they wish one another well and continue with life as planned.
They'd always have Cancun and what happened in Cancun was supposed to stay there. Right?
Three years later:
A bracelet
A story
An Academic advisor
and a handsome little boy

All prove that fate did not want what happened to be just a memory?