Sam kidnapped. Sam develops powers and takes revenge
Hi, i don't remember the whole story. There are three parts to the story as far as i can remember. From what i can remember is that Sam is kidnapped by some people who try to sell him. I think Caleb/Joshua and Dean go undercover to bid on Sam to rescue him. Meanwhile Sam develops his powers and John is scared of Sam after Sam is rescued. In the second part Sam takes revenge using his powers on those who kidnapped him. There is Dean, Bobby, John, and Caleb/Joshua in the story.
I hope i am not mixing two stories but this is all i can remember.
Please help me find it.
Thank you in advance.