Over one hundred prisoners. Against all odds, you had not only escaped, but turned the tables on your captors, trapping them in their own facilities. They'd made mistakes, to be sure, and you'd taken advantage of those mistakes to maximum effect. But then what? They'd get out eventually and you weren't going to be able to stop them yourself... so you did the best you could, you broke into their com station and sent out a signal for help.
And your nearest allies responded. The Rians. Four choppers full of mechanized soldiers. They were certainly a sight to behold, fearsome women wearing amp suits that could carry heavy weapons and out run many vehicles.
With the Rian soldiers here to take control, the base personnel and soldiers were quickly rounded up and secured. At this point you were expected interrogations and possibly executions, but the Rians had something else in mind. All of the prisoners were gathered together into the central mess hall, beds cushions were dragged in from the barracks, and several of the Rian soldiers and officers exited their power armor and began to mate with the prisoners while the others were forced to watch. Some of the Rians opted to be placed under cover, while others performed the act in full view, for all to see.
It quickly became apparent that the Rians were using some kind of sexual mind control or interrogation on the prisoners. They surrendered security codes, plans, procedures, and more with just minutes of interrogation. After each prisoner was interrogated his Rian interrogator made him confess female supremacy and submission to the Rian matriarchy.
Afterwards the prisoners had a dazed expression, eyes wide, expressions changed. The Rians tell you that the effect is not permanent and that they will need further training until they can be made into proper slaves. After watching several dozen of these ceremonial subjugations you begin to find yourself becoming aroused. There is something deeply erotic about what the Rians are doing to the prisoners, and you even begin to feel a tinge of envy for them.
The subjugations continue in shifts, but eventually the Rians become weary and announce a break. The subjugations will continue at dawn tomorrow. You join the soldiers, many now outside of their amp suits and eat lunch with them. You are the only man at the table, but one of the officers points you out, and recognizes your role in the victory. All of the women give you a shouted accolade. Then someone asks you how you felt about the subjugation ceremony. You admit that you'd never seen anything like it before, and the thought had crossed your mind that if this is how enemies are treated, what treatment would you have in store for allies?
That got a laugh from the Rians, and several comments about you deserving a reward for what you had accomplished. The officers agreed that nothing would be done to you against your will, and that you could have your pick of the Rian soldiers and officers to give you a personal reward. You pick out a particularly shapely Rian officer and she takes you aside to what used to be the officers' quarters of the base and closes the door behind her.
"Well, you already saw what we did with the prisoners. Would you like to experience something similar? Not sure? Don't want me to control your mind? Or maybe you do?" She laughs at your uncertainty and sits you down on the bed next to her.
"Look, you know we're a matriarchy, but we do have men and frequently reward them for good behavior. Soldiers? Well yes, we do have men in the military, quite a few, in fact. What you saw here are our special forces and officers, which are all women. Most soldiers are actually men, with women as officers to control them. We believe men are meant to be controlled."
"Isn't that what you want from me? You saw how we controlled our enemies and thought that as an ally you could get the same treatment? Not exactly the same? Well then how would you like it to be different? It's natural for men to want to be controlled, isn't it? Not where you come from? But you're not sure what you want?"
"Alright, let me see if I follow you here. You saw us mind controlling the prisoners, and you found it exciting, and you want to know if there is a different version of the same treatment that we could do to you as a reward, one that doesn't leave you as a slave? Well, when we reward a man for a job well done, he's usually already a slave to one of us. As a foreigner you're a bit of an odd case, but we can work something out. What if you like being a slave? Rian men sure do. Your free will? Oh, slaves have free will, especially useful ones like you. You just use it to serve your owner. But that's easy, I can give you a choice. I'll make you my slave for a day, and at the end you can go free or choose to stay."