The laboratory was a weird place. You were just a baby when you had this black ball of sludge...But it eventually came to life as a Puro. Ever since, you and that Puro have been going everywhere together. Often times sleeping together, playing together, and just having fun. You and him shared a birthday since that creature didn't really have one. But it all worked out fine

After few years, to now this very day, You and him were just sitting at the cafeteria, sharing a pizza

Puro: So, what do you wanna do today? He asks, wagging his tail