“Mom wants you to return the favor.”

“What?” Abby felt her heart thump.

“You know, return the favor.” Sierra grinned “She’ll lie in bed with her eyes closed and you go to town on her.”

Of course, Abby knew that meant the mystery would be up. She wouldn’t be the one with her eyes closed anymore. She’d be the one doing the work. She wouldn’t be able to deny that this was real between her and Mom.

“What about my Dad?” She asked.

“He’s going to be spending tomorrow night with another woman.” Sierra said and Abby looked a little surprised, though she shouldn’t have been. “I told you, they’re swingers, they’re open, your parents are freaks. And you’ve got their freak genes too.”

Considering the night she just had. How could Abby argue?

The next day, again, seemed normal. Although Abby thought she maybe noticed Mom wink at Sierra from across the room. Or maybe her eyes were playing tricks on her. She couldn’t think straight all day.

It was one thing to do what she’d done last night assume it was mom. It would be another thing entirely to be right there, in Mom’s room, looking at her own mother’s naked body, eager for her daughter’s touch. But she couldn’t get out of it.

She didn’t know if she wanted to get out of it.

And by the time night hit, she still didn’t know.

“It’s midnight. It’s time.” Sierra said.

“Is it?” Abby could barely speak. She was all nerves.

Sierra nodded. So the two girls, Sierra in nothing but a pair of lacy black panties, Abby in a much more innocent white cami and polka dot covered panties, made their way to Mom & Dad’s room.

Sierra was right. Mom laid in bed alone.

Abby’s heart had never pounded the way it pounded.

Sierra slid up to the corner of the bed, grabbed a handful of the sheets and slowly slid them off Mom’s body.

It was a magnificent body, fully exposed for Abby to see, large breasts and large nipples, wonderful fleshy hips and thighs, and a trim blonde pussy with a pair of glistening lips.

Mom moaned and writhed as the cold night air hit her. But she kept her eyes closed.

Abby fell to her knees. She was beyond nervous. She couldn’t hold herself up and Sierra, naughty but caring, came over to see what was wrong.

“I can’t do it.” Abby whispered, a shiver in her voice. “I just can’t.”

“It’s okay” Sierra said, stroking her girlfriend’s hair. “Do you trust me?”

Why would Abby trust her? She was the reason all of this happened. The reason why Abby was in this mess of lust and anxiety. And yet Abby said “Yes”

“Just do what I say. If you don’t want to eat out your mom you don’t have to. But we’re here now and you have to do something. Okay?”

Abby visibly trembled “O… okay.”

“Good. Now start by sucking on her toes.”

Abby felt a little better, knowing she wouldn’t have to go all the way. She could maybe manage other things. She crawled to the foot of the bed. Mom’s toe nails were painted silver for the Holidays. Abby wrapped her lips around Mom right big toe and gave it a suck, swirling her tongue around it.

Mom writhed some more and moaned “Mmmm” and Abby continued, sliding her tongue between Mom’s other toes. It was weird. And hot.

Sierra leaned in very close to whisper again. “Now lick up her leg to her thigh.”

So Abby did just that, traced her tongue up her mothers’s leg, past her calf, past her knee, landing on her salty thigh.

There was no denying she was close to Mom’s pussy. As close as she’d ever been except the day of her birth.

“Luck her nipples.” Sierra said.

Abby took a deep breath. This would be going far, but not too far. So her mouth found its way to Mom’s big, erect, nipples and her tongue glided over them. The sensation of them on her tongue, made Abby very wet.

“Mmmmm” Mom moaned some more. Abby had never heard her mother moan like this before. Of course she hadn’t.

“Lick her armpit” Sierra said with a soft giggle.

Abby was too nervous not to follow directions. She glided her tongue across Mom’s big, plump breast, into Mom’s sweaty armpit. It tasted like she expected armpit to taste. But it was Mom’s and somehow it was wonderful.

“Kiss her.” Sierra whispered.

Abby didn’t hesitate. She slid her tongue into Mom’s mouth and Mom reacted by doing the same. It was a long, soft, deeply passionate kiss. Abby felt like perhaps their tongues would tie together in a knot if they went any longer.

As they kissed, Mom’s hand found it’s way down her daughter’s body and into her wet panties. Then her fingers found their way into Abby’s slit.

When the kiss ended, Mom whispered something with a smile. “You make Mommy very happy.”

That was it, Abby thought. This was real. She knew it. Mom knew it. She wanted it. Mom wanted it. She didn’t have to be nervous anymore.

“Open your eyes.” Abby said.