Something Shattered

Loki is given to S.H.I.E.L.D as a prisoner after the events of the first Avengers movie. With his magic bound and his body in a near-mortal state he is tortured until he breaks and then tortured again. Finally Nick Fury is made aware of the situation and he turns to everyone's favorite billionaire: Tony Stark. And that's how Tony is suckered into allowing a damaged Norse God into his tower as his prisoner/servant.