Heck no is the correct answer. A big no.
Especially someone who is not from your barn, who you don't know already, and who doesn't want to lesson. There is no person in the world who is too good for lessons.
If some time down they road you do go into leasing, iron clad contracts that are approved by lawyers is a must. A must.
I would also suggest some kind of liability insurance, because hold harmless waivers sometimes won't hold up, and you want to have the money to take things to court if - god forbid - someone got hurt or killed on your horse. Accidents happen, you have to be ready when you're blamed for them.
Technically if you leased out, too, I'd consider selling the horse to an LLC in your name (you can do it for like, $5...) so that if a lawsuit came to be you could not be held liable for personal assets, but again, I'd get a lawyer.
The equine industry is a messy one, and just like car accidents/people slipping in stores or tripping places, everyone's looking for a lawsuit and some money.
Be careful. Be prepared for the absolute worst.
Or, honestly, just don't lease. Leave that to the professionals and enjoy your ponies yourself!