Y/n (an angel of course using someone as a vessel) breaks into the bunker one night in order to find Castiel, having looking for him for quite a long time before. Y/n would be one of Castiel's brothers, only searching for him to not be alone anymore. The Winchester's would originally not trust Y/n, but Y/n and Bobby would grow close, causing the Winchester's to reluctantly trust Y/n.
Y/n is currently a biology professor in highschool, unaware of the other spider people outside of Miles, only knowing Miles from seeing him in the hallways and in class. Miles didn't know Y/n was also like him, yet he still suspected Y/n being off. He finally found out about Y/n one day after finding him on patrol.