I don't think I would kill you at first just because a dead body doesn't stay fresh for long. So, for a time, I would keep you knocked out, use a feeding tube to keep you fed and watered. You can survive just fine on dog food and its fairly cheap.
This will give me an extended time period to play with you and experiment on you. A shop vac is not only good for keeping you clean, it would most likely get you erect rather quickly. Alas, no good thing lasts forever. Your muscles would begin to show noticeable atrophy after a couple of weeks from lack of exercise. Then, I would ponder how preserve you in the after life. Formaldehyde is a pretty good preservative. But, distributing it throughout your body can be difficult. So, I think I might give it to you as an IV drip. Since you're unconscious its not as though you would feel it and I want maximize the effect before it kills you. So, a little at a time. That should buy a least an extra week of playtime.
Once you are dead and pickled, I might do some odd things with your body. You know, put large things in small places. I definitely want to cut off your head. But, I intend to shrink it as a trophy. The instructions are available on the Internet. It's real not that hard as longe as you have the right tools and chemicals.
Your body could possibly be plasticized. But, no guarantees as I don't have the equipment to do it correctly. But, I can be creative.