Thorasskus transformation how?

[bourbonjon]

Ok... again I did it before & it was easy... how do you get Thorasskiss to transform from a kid to the bastard he actually is so you can kill him. The walkthrough says if you have a Paladin (how has one of those goodie good fullas anyway) it 'may need to talk to him a few times to expose his identity' how many times does it take? Is there any easy way to help this along? Does sleeping then talking to him againactually help?