By sub01

There was no chance in hell of me going soft on Carol, not with her fingers gripping my erection so exquisitely!  She lead me upstairs by my cock.  Several times she tugged me along faster when she apparently deemed that I was following her too slowly.  But I knew the truth: she just wanted to tease me.  What a bitch.

That's how I was starting to think of Carol: a bitch.  She was beautiful and sexy, yes, and I'd give anything to fuck her, but she really was a bitch.  A teasing, tormenting bitch.  But maybe that was just how I wanted to feel about her.  After all, she did hold the key to my sister's chastity belt.

Mary was still in bed wearing her nightie when we came in.  She was lying back with her eyes closed, smiling dreamily as if enjoying a pleasant fantasy, one hand tucked behind her head and the other slowly teasing circles around one of her nipples through the nightie.  With her eyes closed she didn't see us come into the room.  I started to say something, but Carol stopped me with a finger to my lips and an amused smile.

So I stood there quietly, watching without a word, feeling myself swell in Carol's grip as I watched my sister in the throes of what was obviously a pleasant (and probably lewd) daydream.  I felt a strange, voyeuristic pleasure at catching Mary in such an obviously private moment. 

We watched her for a long moment and then finally Carol led me to the bed, careful not to make a sound.  As she held me by my erection, she reached her other hand out and sharply pinched Mary's nipple.

The effect was like lightning.  Mary squealed in surprise and her eyes snapped open.  I could see them fill with embarrassment when she saw Carol and I standing watching her.

"Carol!  Oh my god, you startled me!"

Carol smiled.  "Enjoying a little daydream?"

Mary blushed something awful but didn't say anything.  There was no hiding it, though.  We had definitely caught her in the middle of something.

Carol fingered Mary's nightie with an amused smile.  "What's this?"

"I... I was cold."

"You were horny."

"No!  I, I was--"

"You wanted to look sexy for your brother."

Mary pursed her lips, but she didn't try to deny that.  "I'm sorry, Carol."  She started to reach for the straps on her nightie, to slip it off, but Carol stopped her.

"No, leave it on.  You do look sexy, Mary.  So lovely.  And I do like what it does to your brother."

I blushed.  I was still erect, partly due to Carol's grip on my cock but also, as she no doubt suspected, due to how exquisitely inviting Mary looked.  She really did look sexy in her nightie.

Mary let her hands drop back to her sides.  "Thank you Carol."

"I'll still have to punish you for putting it on, of course."

Of course.

"But later.  Right now, first things first."  Carol turned to me with a smile.  "Despite my better judgment, Brian, I've decided to let your sweet little Mary have a fuck today."

I felt a flood of relief and excitement.  "Thank you."

Carol smiled.  "Don't thank me yet, Brian.  I didn't say you get to be the one to fuck her."

I was confused, but before I could question her Carol turned back to my sister.  "Go get your little black book, Mary."

Mary hesitated.  "Carol, please--"

"Now, Mary."

"But Carol!  Please, not with Brian here!"

Carol moved closer to Mary, intimately close, and stroked her hair gently.  She spoke to her softly now, but not so soft that I couldn't hear.  "Yes, with Brian here.  Now do it, Mary.  If you make me tell you again, I'll make you choose two."

Two of what? I wondered, but didn't ask.

Mary relented, though she didn't look happy at all.  She moved to the nightstand by the bed and retrieved a little black book, and brought it obediently back to Carol.

"No, give it to Brian.  Let's let him choose."

Mary looked dismayed at that but Carol's look was firm.  Even I could see there was no point in arguing with her, whatever this was all about.  Without a word Mary reluctantly handed me the little book, avoiding my eyes as she did.

"Pick one, Brian," Carol told me with a smile.

I frowned.  "One what?"

"One name," Carol said.  "From your sister's book."

I opened the book.  It was a contact book of sorts, it's ruled pages containing a smattering of names and phone numbers, each one written in my sister's cute, unmistakable handwriting.  As I flipped through the few pages one thing became apparent: all the names were of men.

"What's this for?" I asked.

But Carol just smiled.  "Hurry up, Brian.  I haven't got all day."  When I hesitated a moment longer she reached to take the book from me.  "Okay, if you won't pick one, I'll pick two."

"No, wait.  I'll pick one."  I didn't really want to pick one but I had a feeling that one would be better than two, whatever it was for.  I scanned the names and picked one at random.  "Devon."

Carol smiled with amusement.  "Devon Jones?  Oooh, nice!  You have good taste, Brian.  Devon's one of your sister's favorites!"

The look on my sister's face suggested Devon, in fact, wasn't one of her favorites.

"Now put your little book away, Mary." 

Mary took the book from me, still avoiding my eyes, and returned it to the nightstand.  As she did Carol smiled at me.  "Devon's cute, but he's not the guy I would choose to fuck my sister... his cock is fucking huge!"

I stared at Carol, the significance of her words sinking in.  "Oh my god.  You don't mean--?"

"That's right, Brian.  You're going to get to see another man fuck your sweet little sister.  And you even picked the man."

I had been jealous and bitter before, but now I was beside myself.  Just the thought of Mary being with another man was more than I could bear.  Carol couldn't do this!

Apparently Mary wasn't any more thrilled than I was.  "Please Carol, I can't do this!  Not in front of Brian!"

Carol shrugged.  "Then we won't let him watch.  Now go get ready, my pet.  You know how Devon likes to have you."

But Mary remained frozen to her spot.  "Carol, please!"

"Begging is good," Carol laughed, "but disobedience is not.  Now hurry along."

"Carol!"

Carol moved to my sister and put her hands on her cheeks, coaxing her to look into her eyes.  "If  you like, Mary, I'll let Devon fuck you in your ass..."

That shut my sister up.  She stared at Carol wide eyed.  "Oh my god!  I... I couldn't do that!  You know he's too big, Carol!"

"Then I suggest you hurry along."

Mary hesitated, and then avoiding my eyes she turned and went into the bathroom.  She left the door open and in the mirror I could see a glimpse of her laying things out on the counter.  Lipstick, nail polish, her brush.  A tube of lubrication...

Carol winked at me and leaned close, whispering to me softly.  "Just between you and me, Brian, I think I'll let Devon fuck her ass anyway.  And if you're really, really good, maybe I'll even let you watch..."  And with that Carol turned and left the bedroom.

I remained rooted to my spot for a long moment, burning with jealousy.  I considered going after Carol and pleading with her not to make my sweet Mary do this, but somehow I knew my pleas would be in vain.  So instead I went into the bathroom where Mary was preparing herself for her lover.

She was sitting on the closed toilet seat, applying bright red nail polish to her toe nails.  She had already done her lips with a discreet shade of red, very sexy.  I watched her in silence.  She refused to look up at me, avoided my gaze even as she finished with her toe nails and moved on to do her finger nails too.  She wouldn't look at me, but she was blushing.

My  gaze came to the lube of lubrication she'd set out on the counter and my jealousy surged.  "You're not really going to do this, are you?" I asked her quietly.

"I'm sorry, Brian.  I have to."

"But Mary--!"

Now Mary looked up at me, even managing a reluctant smile.  "I'm sorry Brian.  Please don't be mad at me."

"I could never be mad at you, Mary."  I touched her hair softly, stroking it, meeting her smile with my own.  She looked so beautiful, so alluring... her painted lips so sexy, though all I could think about now was that soon they would be wrapped around another man's penis.  "I just don't want you to do this, that's all." 

"I... I have to," she said softly.  "If I don't, Carol will punish me.  And she'll probably keep me in this belt for a month!"

I stroked Mary's hair for a moment longer.  "Well, we can't have that, can we?"

Mary smiled.  "No, we can't.  I'd go crazy!"

"Then we'll just have to get you out of it."  Out of the belt, and out of this ridiculous notion of being fucked by anyone but me.  Because I was starting to think of Mary as my own.  Not Carol's, not anyone else's... mine.  And right now Carol was downstairs calling another man to come fuck her.

"Well, that's not going to happen."

Mary frowned.  "What's not going to happen?"

But I was already hurrying through the door.