1) Promises can be very dark or unpleasant in nature. The greater the request, the more one must promise in return to balance it out. It should be something the character would struggle with, not given too easily, and it could potentially be something sexual or kinky as you've suggested!
2) Designation would not necessarily matter. Businesses in Insincerity operate under their own rules. If a promise made at the Repair Shop would violate Duplicity law or cultural taboos, well, that's not their problem — though it may be a problem for the one who fulfills it should the authorities in Duplicity find out.
no subject
To answer each of your questions:
1) Promises can be very dark or unpleasant in nature. The greater the request, the more one must promise in return to balance it out. It should be something the character would struggle with, not given too easily, and it could potentially be something sexual or kinky as you've suggested!
2) Designation would not necessarily matter. Businesses in Insincerity operate under their own rules. If a promise made at the Repair Shop would violate Duplicity law or cultural taboos, well, that's not their problem — though it may be a problem for the one who fulfills it should the authorities in Duplicity find out.