Debtee

If a person indebted to another makes his creditor or debtee his executor , or if such a creditor obtains letters of administration to his debtor ; in these cases the law gives him a remedy for his debt by allowing him to retain so much as will pay himself

Source: wiktionary

The debtee also relies on the debtor to be financially successful themselves to pay the instalments of the debt as necessary.

Source: wiktionary