Isekai Taneuma Seikatsu - Dorei Senshi No

The core fantasy of the series kicks into high gear here. Ryu is dispatched to the estates of other nobles with a singular, envious directive: to mate with their female slaves to "improve their bloodline." In one notable instance, after a successful joint duel, he is sent on a mission to breed the beautiful female slaves of another household.

Tied directly to the plot. Progression relies on contractual duties assigned by the nobility rather than chance encounters.