You are Dean and Castiel’s daughter. You live in a house not too far from the bunker. You suffer from depression, and both of your fathers are at a complete loss for how to handle it.
Sam is fourteen. You are sixteen. Dean is eighteen. You are the third Winchester sibling, older than Sam but younger than Dean. Sam comes to you, coming out as transgender, terrified about how you and the rest of the family will react.
Dean never really understood Y/N’s age regressing. Sam tried to be supportive, but was confused by it as well. When they involuntarily regress on a hunt, Dean gets frustrated.
Y/N hunted with the Winchesters for many years. When they were turned into a vampire, they did their best to stay a hunter and not hurt innocents. Eventually, they and Dean fell in love, and conceived twins. Y/N died before the twins were born.
Dean Winchester is incredibly touch starved and mentally ill. When he gets de-aged to a toddler’s body and mentality, with all Dean’s memories intact, Y/N takes scare of him.
You’re Dean’s kid. At age 4, you live in the Bunker with Cas, Sam, Dean, Jack, Charlie, Claire, and Bobby. Basically, your life is crazy in the best way possible.
Cas and Dean are a couple, and they are… freaky. Y/N, a vampire hunter with super hearing, can hear everything as Cas fucks Dean, can hear all of the dirty talk and breeding kink happening.