Castiel is a hybrid. Part human. Part cat. He and his family were sort of strays. Sure, they had a place to stay, but it was an abandoned building with no water or no electricity. Humans looked down upon these type of people. Hybrids were freaks in their eyes and wanted nothing to do with them. They refused to help out the creatures, refusing to give them jobs or feed them. One day, Castiel was out looking for food for his family, when he gets captured by these men, who sell hybrids and make thousands of dollars. Castiel was stuck in containment for a while, eventually losing track of time. He figures no one would buy him, being the "freak" that he is, and he would be let go. But, he had no such luck. One day before he had his dinner, this tall man came in, saying that he wanted Castiel and Castiel got sold. The tall man treated him well, never hurting the boy. Castiel found himself slowly developing feelings for the tall man, and was so scared of these new feelings. He hoped that the man would never find out his feelings, but as Castiel's luck goes, he did. What the hell was Castiel going to do now? {Sastiel AU}