Idea: Victorian Sexting
Before there was texting there was email, the postal service, and the telegraph. Before that there was hand delivery.
Two adulterous nobles secretly exchange lusty letters via a discreet messenger boy, hiding their liaisons from their spouses. Frequently the boy is forced to perform what the text only hints at, used to relieve the sexual tension shared by the forbidden lovers.
"M’Lord… you… your fair lady… she… doth lift your stately robes… and… gulp taketh thine glorious member into her mouth… and… press to meet your… belly?! Please M’Lord… please no…"
Rapidly the boy services become a necessary part of their affair, a slave and a sex toy whose exposure would lead to the ruin of all.
Things are made all the more complex by rumors and the serving staff at each of the manor houses. Downton Abbey style of course :p But more in Regency / Napoleonic era.
What started out as a simple task of delivering indiscretions rapidly turns into the boy finding himself too deep to escape. Each of the nobles putting him to more and more degrading tasks.
Uncertain as to what the “dirt” is that they have on him to ensure his quiet submission to the ordeal