Alright so first you're gonna wanna get a collar and leash. This is useful to keep your guest in a specified radius. It should be long enough to reach the bathroom and bedroom.

Secondly you're gonna wanna hire someone to stand watch and shout if necessary. They should be able to monitor your guest should any issues arrive. You might also need a leash and collar for your guard, in case he decides to go for the refrigerator as well.

Next up you're gonna wanna get a bike lock for the fridge door. If guest thinks it's suspicious tell them you have a half dead body in there that you don't want getting out. He will understand.

Finally you're probably gonna wanna just get your buddy an Airbnb for the night instead