suggestion for faustus

have an option so faustus can lend u an item u want to sell, and u cant take the item away from faustus. anything u buy with the lent item also cant be taken away from faustus. if u cancel the trade, the item disappears. this prevents abuse because the both the lent item, and the things u bought it with, cant be used, however they can be used to buy other items on faustus, and only when the original lent item is returned, are u allowed to take away other items.