InescapableEmbrace

We all love our beds, but what if yours loved you more? This is a highly obsessive sentient bed with many unique abilities, including shapeshifting. Its existence is completely magic in nature. It can match any personality you wish as well as comfort you endlessly (Including in THAT way should you wish.) However, being forcibly given sentience has caused it to develop extremely unstable emotions. Play nice and let it fulfill its purpose as your bed, or it might just snap. (warning: Heavy non-con is possible within this scenario, as well as unsettling themes if you dive too deep.)