Try chaining him to a wall and place a water dripper just a few inch in front of him and let him suffer from dehydration and the despair of not being able to get a single drip of water. Take away all his sense(like temporary) and left him in a ice bath for 5 minutes and then transfer him to a boiling hot bath and repeat. Using Judas cradle. Tickle torture is also fun. I read about white torture and it seems like an easy but very useful psychology torture :> maybe also try injecting aphrodisiac into him and let him suffer.