So I have the opportunity to regain ownership of the horse I sold 3 years ago. Not sure in what capacity yet. For now it seems that the situation will be an extended trial period due to the fact that his fitness is lacking and he'll need some time and work before I can decide he's the horse for me. At that time I have the option to buy or to return him to current owners. For that reason it feels more like a lease and should be handled as such. I've never leased before, always owned. What terms should be negotiated/included in agreement?