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There is a real-life pyschological condition where some people are attracted to and develop feelings for inanimate objects. A young woman had a marriage ceremony for herself and a large doll, for instance.
Not a hentai so this isnt it but it sounds like prozd's Chairum series.
The "this" I was referring to was actually a comment on Proz D's first "Tokomo Chariem" video.
So, while I was browsing the web I *also* came across THIS: "There is literally a romance hentai where the girl's love interests are a blanket and a table." Anyone know what they're talking about?