The men in Nana's family carry a very strange curse. They swap bodies with anyone they kiss. Tsuna really wishes he'd known that before he fell onto the pretty girl with the very loud brother...

Kurama! Kurama, go right to baa-chan! Get to her or I'm going to smack you, believe it! “Ha,” Kurama mutters under his breath, and deliberately turns away from the hospital, heading for the market instead. “You're not in the driver’s seat right now, brat. Let’s see how you like it.” Kurama! Kurama, don’t you do anything— “Sorry, can't hear you,” Kurama says smugly, and drowns out Naruto's voice from his inner world with all the spite of twenty-three years spent watching his host shovel down a truly nauseating amount of ramen each day.