"Say... Wanna be my mistress?" (MxF, looking for F)

Hi! My name is Mini, let's get to the plot. Sadly I don't have an exact plot, but let me introduce the character I wanna use first, then get to some ideas I have.

This is Yul. He is meant to be a chaotic good character, and powerful enough to be a guardian figure for those he gets paired up with. Arrogant, a strong ego, and a lot of enthusiasm. But also protective, resourceful, knowledgeable. He still has some work to do on himself, but that's half the fun when roleplaying, isn't it? Room for improvement.

Anyway! The scenario I would like to throw him in is him meeting someone who he offers a deal few would expect.

-Stomach empty, mind desperate, knife sharp, and a target acquired. Your character attempts to mug Yup as a last resort to survive, but as it turns out, her target is skilled. Rather than do her in however or punish her, he states that he can relate to being hungry, and offers a meal if she parts from her knife.

-A slave auction is about to start. Who is your character? A warrior? A noble? Whatever the case, it mattered little now since all she could do was wait in a cage for what was to come. Maybe she was just distracted, but suddenly, Yul would suddenly be at the side of her cage and chat with her, whether she likes it or not. But what would probably catch her interest was the offer he was about to make.

Probably a bit of a special case:
-You did it! Your party slayed the demon king and saved the world. Upon return, a celebration was held, and the king arranged rewards that would fit this party of heroes. But... he would also ask if he could request one more thing. To slay someone who held the kingdom, nay the world in an iron grip. Of course your party accepted and asked for details.
Once they arrived, everything seemed to happen so fast. The one they were sent after was stronger than the demon lord they slayed. Cutting through magic, hitting with fists seemingly made of iron, and catching even the hero's sword. What was happening? With every party member by now having taken a few blows, and some equipment getting destroyed, the figure clapped a few times to get everyone's attention. "Everyone had their fill? Because if you have a moment or two, how about we talk this out after all? But where are my manners? My name is Yul B Allwright. And who are you?"

Regardless of which starter you choose, he would make your character an unusual offer. To become his mistress. That way she would have a powerful shield, a mights sword, (and in the case of the last scenario, be able to keep an eye on him). But the deal comes with 3 rules.
1: Yul can deny orders if he can explain how doing it would bring harm to him or her.
2: Yul must carry out all reasonable orders given by the master to the best of his abilities, even if they contradict with his values.
3: She has to reward him for jobs well done. Either right away, or at the end of the day (at which the reward value could potentially pile up).

And the reward part is the naughty bit. I'd like to start things mild, then ramp up, but I am open for suggestions. But regardless, Yul would ask for intimate, lewd, perverted things in return for his services. A kiss, sharing a bathtub, sex in her bed, let her endure sex toys, lewd acts in public. That and whatever we as partners wanna try.

If this plot interests you, let me know at your earliest convenience~ I am also open for other suggestions and changes, so feel free to write here, or send me a PM if you have something on your mind.