If you haven't seen John Carpenter's Starman, go rectify it, I'll wait.
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Right, that, but with Finn and Poe. Poe is the grieving husband who has lost the love of his life, and doesn't know how to cope. FN-2187 is the alien who crashes on Earth and assumes his dead husbands identity, then takes her on a cross country adventure as he tries to get home. Along the way, Poe teaches this Finn about humanity and they fall in love.
Finn/Poe, Starman AU
...
Right, that, but with Finn and Poe. Poe is the grieving husband who has lost the love of his life, and doesn't know how to cope. FN-2187 is the alien who crashes on Earth and assumes his dead husbands identity, then takes her on a cross country adventure as he tries to get home. Along the way, Poe teaches this Finn about humanity and they fall in love.