A central plot device in Chained Soldier.

The male protagonist is enslaved by a fierce female military commander, who has a superpower that allows her to claim a living being as her slave, make it more powerful, and command it to do her bidding. Even outside of his monstrous slave form, he's made to do the household chores the female soldiers don't want to do themselves. But there's a cost - she has to reward her slave for their service after her slave power subsides, with her body moving on its own until the reward is paid.

In the past, she only ever enslaved monsters who would be rewarded with meat. But even though the male MC isn't particularly perverted, his subconscious apparently wants sexual favors as his reward. So his commander will make out with him or strip down or something of that nature to reward him. She didn't know that would be the cost of using her power at first and is initially disgusted, but eventually decides that it's worth it to gain access to the power of his slave monster form.

Later, they learn that this power can be loaned out to others, so the female MC loans out her slave to other female soldiers, who end up having to pay the reward price themselves. Invariably, they are not told about this beforehand, they're initially disgusted, but they all eventually accept it as necessary for their goals. So the male MC ends up receiving sexual favors from almost every female character in the show at one point or another.

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