Actually this is a really good concept for a horror story.
It’s a super-advanced memory foam bed, and the married man and woman sleep there for years, but then he gets killed in a car accident. And she’s sad, so the bed in the middle of the night keeps blobbing up the shape of her husband to comfort her. And she just thinks they are really weird mourning dreams.
But every time she puts up with it, the bed starts to fall in love with her, and tries harder to manifest the blob as an actual person it can possess so it can “love” her as her husband.
The end would be her giving in and agreeing to fuck the foam man and then she gets pregnant, setting up the sequel.
I’d call it, “Let Me Tuck You In,” which is what her husband would have jokingly said every night before they went to bed.