Okane ga Nai, Shounen Maid Kuuro-kun: Tenshi no Uta Recommendations
both are about having to do sexual things essentially in exchange for cash or to pay back debts. while okane ga nai has more of a plot to it and more substance, they are essentially the same. SHOTA!!
Girly uke that's in debt and sells his body to a super rich guy. Contains lots of sex.