The day after the event, Amy and Kira vanished from my apartment. Three days after the event, I received two letters in the mail. Amy must have dropped them in the mailbox just before they took the pills.
Letter 1
________________________
Dearest Stranger,
I am a sexually adventurous woman. There are few things I am not willing to try. When Kira confessed to me that she had allowed a man to jerk off onto my face while I was sleeping, I was angry at first. Who wouldn't be? But then I thought about it. The dynamics of the strong, controlling male and the helpless female have always fascinated me. I love being tied up. Blindfolded. Forced to be the sexual plaything of a powerful man. So learning that I was completely unaware when some stranger made my face the target of his lust has really turned me on. I was the ultimate helpless female.
Kira has told me that you want a repeat of the event. She has hinted that you might want to go a lot farther next time. She offered to tell me your name, but I don't want that. And I do want you to have me, to take all that you want from me.
But be warned, I will know you sooner or later.
Love, Amy
________________________
Ever since the night Kira caught me jerking off on my drunk sister's face, she had been teasing me about it. It had been several months since that strange, surreal night and every week, I received several sexy new pictures of Amy on my phone.
I couldn't bring myself to delete them as I should. They were photos of things a man should never see his sister doing. They were the kind of photos that should send a girl's brother to go and kick somebody's ass. Some of them were selfies taken in various places, in bikinis and lingerie and other revealing outfits. Others showed her topless or naked. There were dozens of pictures of Amy and Kira kissing and fondling each other. And one was a selfie my sister took while giving somebody a blowjob.
It was Kira sending me these photos. She had told me, after the incident, to just let her know if I ever wanted to splatter my sister's face again. The first time had been an unexpected opportunity that I'd taken advantage of. Amy had been drunk off her ass and I was having a weak and angry moment, needing to punish her. It should not have happened. But Kira was eager to arrange an encore of that event.
I was determined that nothing like that would never happen again. I was not some pervert, I told myself. And yet, I couldn't stop thinking about it either. I stared at the picture of Amy with the cock in her mouth and berated myself for not sliding my own dick in her pretty face when I had the chance. Every day, I had to remind myself that such a thing was sick and twisted and NOT GONNA HAPPEN.
What I should have done was kick the girls out. Or moved out myself. Having two party girls sharing one of my spare bedrooms continuously disrupted the quiet lifestyle I'd tried to build for myself. I never knew when strange men would pop out of the girls' bedroom as I ate my Corn Flakes. My sleep was frequently interrupted by giggles, moans, and the occasional drunken argument.
But I couldn't toss them out. Amy was my sister, and I loved her. I had always been there for her and that wasn't going to change. But deep down, in places I was afraid to look at too closely, I was too turned on by the sexy wild child she had become. She was the dirty sex fantasy every man hides from himself. Each morning, I had to remind myself that the previous incident would not be repeated because every single night, I was fantasizing about exactly that.
And then came the party. A casual meet and mingle at the University where I taught. My date was Kristen. Nothing romantic, but a reliable friends-with-benefits relationship. Normally, our evenings out ended in her bedroom, but on this night, it ended an hour after our arrival at the party. Kristen had put off telling me as long as possible, but once we were face to face again, she broke the news. She had met someone, and wanted to try for a real romance for awhile. So her friendship with me would be strictly platonic from that moment on. And after dropping that bomb, she left.
I honestly wished the best for Kristen, and I hoped it worked out with the new guy. But I had really been looking forward to the standard end of our date. The need for a female was a powerful urge that night.
And Amy came into my mind. I tried dismissing her from my thoughts, but my attempt was dishonest. I thought about Kira instead. Maybe I could talk Kira into bed, I told myself. But it was a lie. I already knew Kira would be willing. She had told me so herself. Several times. Every time she offered me my sister, she offered herself as well. Pretending to wonder if I could seduce Kira, I was dangling forbidden fruit dangerously close to my libido. I knew exactly what would happen if I even approached Kira. She and Amy shared at least half the guys and girls they brought home already. But I let the idea whirl in my thoughts, telling myself the whole time that it was just Kira I was considering.
It took just a few moments to make a terrible mistake. Just a quick text. I sent the words "I'm ready," to Kira. I had never texted her before, not to thank her for keeping Amy in the dark about how her face ended up covered in dried cum, not to shame her for sending me such inappropriate photos of my sister. So this brief message, once I sent it out into the ether, was certainly going to send a clear signal to Kira as to what I wanted.
Half a minute later, I was regretting the message. I was wanting to take it back. But it was too late. The words were out there. And the response came quickly back to me. "Give me three hours. Amy and I will be in our bedroom. You'll have total freedom."
And at that point I gave up. There would be no more fighting it. Whatever Kira prepared for me, I was along for the ride. Just as I knew I would be as I composed that text.