Coba is a very close partner to Lightning. They met on Lovcore and Coba seems to adore Lightning right to the core, literally. Coba spends a majority of time in a tight embrace with Lightning's core, essentially living inside of her. Of course this doesn't go without benefits, as Coba can provide energy bursts, delight and pleasure to Lightning whenever Coba and/or Lightning wishes. From time to time Coba will come out to cuddle Lightning in person, but for the most part, spends time inside of Lightning.