It started as a half joke, my wife telling her best friend "if anything ever happens to me, you need to marry Jason. He'll need a woman to look after him and my kids will need a mom." Julie was perennially single, and at 40 it was likely she wasn't going to ever have kids of her own. She was the godmother to both of our kids and they absolutely adored her.
Julie was single, but not because she wasn't attractive. Dark hair, incredible green eyes, and olive skin from her native Greece. She had been my wife Rachel's best friend since high school.
Julie came out to spend a few weeks with us over the summer holidays and her dating situation had come up a few times. The joke about marrying me was brought out again with my wife warning her "You better not have any plans to knock me off, I'll be keeping my eye on you."
We had all gone to bed, Rachel and I in our room and Julie in the guest room next to ours. A few minutes after the lights were out Rachel got out of bed and said she needed to take care of something and left the room. This wasn't unusual, so I rolled over and tried to go to sleep.
I heard Rachel come back and slip in the bed but I could tell something was off. I turned and noticed in the pale moonlight that the figure slipping in the bed with me wasn't Rachel, it was Julie.
She could see my look of surprise as I recognized her and she put her finger to my lips and said "sshh.. Rachel told me to come over here."
She replaced her finger with her lips and began kissing me. I was stunned at first, it was so unexpected. Soon, my body responded to the woman in a silky teddy that was pressed against me and I kissed her back. Her mouth moved against mine, passionately, kissing me with a desperation and fierceness I had not felt from a woman in a long time.
As was my usual nightly ritual I was sleeping in the nude, so it didn't take long for her hand to travel down my body, over my chest, my abs, and down to my groin where she grabbed what I am sure she was expecting a hard cock, and instead got an iron-hard stainless steel chastity cage. She looked at me, questions in her eyes.
"It's something Rachel and I do." I told her. "She keeps me in chastity, I'm locked up and she has the key."
Julie laughed "Oh, I wasn't expecting this... we were talking while you were out and she told me I should sneak in your bed tonight, that you'd 'take care of me' and she wouldn't mind. Now I see why she isn't worried."
"She likes to tease me while I'm locked up. She'll get me so horny, but I can't do anything about it. It keeps me on edge and horny all the time. I don't get to come, but I get off on making her orgasm over and over again." I tell her.