Imagine your characters waking up to find out that person A has somehow switched sex. B at first thinks A is a burglar and attacks them. They're both freaked out bit A and B try to get used to it. Whether A switches back is up to you.
Bonus (if it was a gay couple): Eventually, they realize it's a chance for them to finally have children

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Writing Prompts
RandomThis is a book full of writing promts. Most prompts in the beginning are romantic. Note: some of these are from places such as tumblr, Instagram, ect. or have been sent to me, not all of these are mine