Deal With The Devil (Alvin x Simon) Malexmale

After Simon gets cancer, alvin makes a deal with a demon to cure him. Everything is fine from there until... Alvin's past is brought up.

Oh no, what did alvin do in the past that is so bad. Who is this demon and why did it choose to help Alvin. Well find out.

Set after Alvin and the chipmunks road trip. AU where Dave an samantha DID get married. Warning mpreg.