Note: This story was dynamically reformatted for online reading convenience.
 
 Chapter 15 When Sam got home, Marcie's red Miata was once more parked in
the driveway.  There was no sign of Joan or Marcie downstairs, but faint
sounds came drifting from Joan's room.  With a private grin Sam climbed the
stairs and knocked on the door.

   "Is that you, Sam?" Joan called from inside.

   "Yeah, it's me," he answered.

   "Well, what are you waiting for?  Come in."

   Sam entered to find Joan and Marcie in bed together, their clothing
scattered about the floor.  Joan was propped up on a couple of pillows,
cradling Marcie in her arms; Marcie suckled at one of Joan's tits, for all
the world like a baby nursing.

   "Hey, Sam," Joan said, stroking Marcie's hair.  "How was the test?"

   "Easy," Sam said.  "Hi, fuck toy."

   Marcie didn't stop, but she gave a little moan at his greeting, which
sent a tremble of pleasure through Joan's frame.

   "I see you two have been busy," Sam commented.

   "Yeah, well, we didn't have you to entertain us," Joan said.  "Oh, that
feels good, baby...do you want to join in?" she asked Sam.

   Despite his recent session with Vanessa, Sam was hard again at the sight
of the two girls making out.  He answered his sister by dropping his book
bag and pulling off his shirt.  When he was completely nude he approached
the bed and pulled back the covers, revealing the two lovely girls.  Joan
looked up at him with an inviting smile, turning slightly to stretch out
her long dancer's legs.  Marcie was lying on her side, her arms around
Joan's waist, while she licked and sucked at the other girl's nipples.  Sam
admired them for a few moments, two beauties in the flush of sexual heat.
He sat on the edge of the bed behind Marcie, easing a hand between her
legs. She moaned again at his touch.  Her pussy was very wet; she was
clearly aroused and ready for him.  She rolled more onto her stomach and
spread her legs.

   Sliding closer to her, Sam put the tip of his cock against Marcie's
opening and gently pressed in.  She groaned in pleasure, pausing in her
attack on Joan's tits to say "Oh, God, that feels good, Sam!"

   "Feels great to me," he grunted, letting his weight come down across her
body.  Marcie was now pressed tightly between Sam and Joan.  Joan tilted
Marcie's chin up for a kiss, then leaned past her to kiss Sam, her hands
moving on Marcie's body.  Sam's tongue traced the line of Joan's lips,
before drawing her own tongue into his mouth.  Marcie was making small
sounds of pleasure as Sam's cock thrust repeatedly into her cunt and Joan's
fingers caressed her.

   "Oh, oh, please, fuck me, fuck me," Marcie pleaded.  "I, I, I need it so
badly...oh, it feels so good..."

   Sam continued pumping in and out of her, but his attention was focussed
on Joan as they made out.  Joan nibbled at his ear, while his lips nuzzled
her throat.  Joan's hands had found Marcie's breasts, and she gently
tweaked and pinched her nipples in time to Sam's thrusts.  Marcie was
almost incoherent with pleasure now, low moans coming continuously from
her. Without pausing in his movements, Sam wriggled one hand under her; his
finger reached Marcie's clit, and stroked.  This was all that she needed to
push her over the edge; Marcie half-screamed as she came, sweaty body
thrashing between her two lovers as they continued to kiss each other
passionately across her.

   Sam had not yet come.  He let Marcie's orgasm ease before withdrawing
from inside her and letting her roll over, panting with exhaustion but eyes
glowing in ecstasy.  Seconds later he was on Joan, her legs spread wide to
receive him, and thrust deeply into her willing cunt.  Ready as she was,
Joan still gasped as his hardness filled her.

   "Oh, damn, brother," she whispered intensely.  "I love you so much; I
love holding you, and kissing you, and fucking you..."

   "I love you, too, sis," Sam said back.  "You're mine...you'll always be
mine..."

   Joan groaned her acceptance as Sam claimed her.  She didn't know if
there would ever be other men for her; but she knew, whether there were or
not, a part of her would always be Sam's, that she would be his whenever he
wished.  He was her brother, and her lover; but he was more than that.  He
was something she didn't even have words for, and she was his.

   Sam came, then, and Joan came as well, an eruption of raw sexual power
through her body, pulling her in, obliterating thought.  She floated on a
tide of pleasure, filled with a sweetness that was more than just sex. 
Joan gradually came to herself, feeling her brother's warm weight on her,
his softening prick inside her.  Marcie lay beside her with a look close to
awe on her face.  Joan felt bathed in love, warm and relaxed and content.

   "It's all right, Marcie," Joan said, feeling moved to offer some kind of
reassurance.

   "It looked more than just all right," Marcie said.  "Do...do I look like
that?  When Sam is fucking me, I mean?"

   "I don't know how I look, so how could I say?" Joan answered.  "But you
looked pretty damned happy."

   "I was.  I am," Marcie said, so quietly that she was barely audible. 
"Very happy."

   The three of them rested for a long time, pressed close together on
Joan's bed, which hadn't been made with threesomes in mind.  After a while,
Joan spoke up.

   "Oh, Gina called.  She said dinner tonight is fine with her folks."

   "Great." Sam yawned.  "I'd better call Mom at work and tell her."

   "So, you won't be here, later?" Marcie asked, sounding disappointed. 
Joan laughed.

   "What, haven't you had enough?"

   Marcie looked a little embarrassed, but gave a shy grin.  "I don't know
if I could ever have enough.  But I guess it'll have to do."

   After resting a bit longer, Sam went for a much-needed shower.  He
dressed with a bit more care than usual, wanting to make a good impression
on Gina's father and stepmom.  In a way, he felt silly; he'd known them for
years, since he and Gina had both been kids.  But things were different
now, even if they didn't yet realize it.

   Sam phoned his mother at work to tell her about Gina's dinner
invitation.

   "OK," she agreed, when he'd explained.  "You can eat over there, if you
like.  Are you planning to tell her parents anything?"

   "I don't know," Sam said.  "I think I'll play it by ear.  It would be
good if Gina's parents were all right with us being together -- she could
stay over here whenever she wanted, or I could stay over there.  But I
don't want to risk turning them against us.  I'll see how it goes."

   "Sounds smart," Caroline agreed.  She dropped her voice a little.  "My
only regret, baby, is that you won't be there to fuck my brains out when I
get home."

   Sam laughed.  "I'll make it up to you."

   "Oh, believe me, you will." Her voice was practically purring out of the
phone.

   "Well, Marcie's here," Sam said.  "Maybe she can help console you."

   "Sounds nice," Caroline agreed, her voice dropping even lower.  "But not
really a substitute for feeling your long, hard cock inside me."

   Sam had never imagined hearing his mother talk like that, but found it
really turned him on.  "Hmmm," he said.  "It's getting longer and harder
just listening to you."

   "Really?" she asked, no more than a breathy whisper now.

   "Absolutely."

   "That's nice.  Long, and hard, and thick.  You know, my snatch is
getting all wet just thinking about it."

   "Is it?" Sam said.

   "Definitely.  All hot and wet."

   "Is anybody there?" Sam asked her.

   "No.  But my office door is open."

   "Are you sitting at your desk?" Sam visualized the layout of his
mother's office.

   "Yes, I am," she said.

   "They couldn't see, then, if you put your hand in your lap..."

   "No," Caroline agreed.  "Ooohh."

   "...and then pulled up your skirt..."

   "Uh-huh.."

   "...and slid your fingers inside your panties..."

   "Oh, God," Caroline moaned slightly.  "OK, they're there."

   "How does it feel?" Sam asked her.

   "G-good.  All hot...and slippery..."

   "You could rub yourself a little," Sam suggested.

   "Yeah...oh, fuck..." Caroline's whisper sounded strained.

   "Does it feel nice?"

   "Very...very..nice..."

   "Can you imagine that it was my hand?"

   "Ooohh..."

   "And that I was rubbing your clit?"

   "Jesus, oh, oh..."

   "While sliding a finger deep inside you?"

   "Oh...honey...I'm going to come..."

   Sam was grinning to himself.  "That sounds like an excellent idea.  Why
don't you come for me?"

   "Oh, fuck..." a strangled gasp came over the phone as Caroline tried to
stifle the sounds of her orgasm.  Sam wondered if the secretary, right
outside the door to his mother's office, could hear.  Caroline was
breathing heavily now, trying to recover without making too much noise.

   "Baby...that was..." she broke off abruptly.  Then Sam heard her speak
to someone else, "Oh, hello, Mr.  Reynolds...yes, I have that memo right
here...sorry, I was just talking to my son...I'll get off and bring it over
to your office...right, it'll just be a minute."

   "I thought," Sam said, "that you'd already gotten off."

   "Very funny," Caroline said.  "That was nice, sweetie, but if you do it
too often I'm going to get fired." She didn't sound mad, though, just
breathless and happy.

   "I'll try to save it for special occasions, then," Sam said teasingly.

   "Yes, do that," Caroline said.  "Have a nice time at Gina's.  Don't do
anything I wouldn't do."

   "Not sure what that would be," Sam said, "but I won't.  Love you."

   "Love you, too, baby.  Bye." The phone clicked down.