Ephemeral

ephemeral
ɪˈfɛm(ə)r(ə)l,-ˈfiːm-/Submit
adjective
1.
lasting for a very short time.

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Summary: They knew they were a time bomb, but they pulled the key anyway. Dan and Phil knew more than anyone that death wasn't kind to anyone, and though they know it's a bad idea, they can't help but fall in love.