The body-sharing trope is peak slow-burn material. The MC transmigrates into a body that already has its original soul, or they must share a body with the love interest. Talk about forced proximity! They're literally together every second, hearing each other's thoughts.
Romance in that scenario has to be slow. There's no privacy, no mystery initially. The burn is about overcoming annoyance and learning deep, profound intimacy against your will. It's about fighting together, making compromises, and eventually not being able to imagine existence without that other voice in your head. The shift from 'get out of my head' to 'please don't ever leave' is a monumental emotional journey. The first time they gain separate physical forms and can finally choose to be together is the ultimate payoff.