Helen was indeed awake

As Clair rubbed her pussy on Helen's face her she began to wonder if she was wrong and her sister was still asleep, but after a few moments she felt a tongue gently probing her lips.
"Oh yea, I knew you were awake" Clair stated as she lifted off her sister in order to see her better. Helen had other ideas however and reached up and grasped her hips pulling her pussy back down onto her tongue. She began licking long strokes back and forth along Clair's pussy, swirling her tongue in circles around her clit at the end of each upstroke.

Realising Helen was not just awake, but was in fact okay with the situation Joe began fucking her in earnest, thrusting his cock in and out harder and faster than before. He'd been holding back, afraid of waking Helen if he was too vigorous, but now that was clearly not a concern. He reached up and grabbed the spare pillow from beside Helen's head, then lifting her hips pushed it under her. Helens pussy was now more deliciously exposed and he held her ankles, bending her legs forward, opening her up even more.

Joe continued to fuck his sister in law, penetrating her as far as he could with each stroke as she continued eating his wife's pussy. He leaned forward and began kissing his wife's sexy ass as she ground herself down on her sister's eager mouth.

"Oh fuck, that is so good you guys" Clair moaned. "Fuck, you've licked pussy before haven't you sis? You're too good at that for it to be your first time." Helen said something in response, but with Clair's pussy plastered on her face, neither Joe nor Clair could make out what she'd said.
"Hah" Joe snorted, "you're going to have to lift up if we're going to hear her baby".
"Not a chance" replied Clair, "I'm enjoying her tongue too much."

"Yea, well I want to know what she said" Joe replied and grabbing his wife pushed her forward off Helen's face. "What was that you said babe?" he queried as he resumed fucking Helen again. "Have you licked pussy before?"

Helen blushed, a somewhat surprising reaction given the circumstances. "No, never... I've just.." she began.
"What?" Joe pushed her. "You what?"
"I've... I've just fantasised about doing this before... "
"What do you mean 'this'?" Clair queried, now interested."
All of this, being with you, Joe, everything. This feels way better than fantasy though! I've wanted this since you guys first got together."
"Really?" both Joe and Clair queried in unison.
Joe had now forgotten about his cock and only idly thrusting slowly in and out, while Clair had moved to sit beside them.
"Yes, well, at first it was just you Joe, as soon as Clair introduced you I wanted you and began fantasising about you fucking me. It wasn't long though before I imagined Clair catching us. From there I imagined her joining in and ever since I've wanted both of you. I never imagined this would actually happen though!"

"Are you...in love with Joe?" Clair asked, frowning. "I don't know if I could accept that."
"Yes.. No... I mean I don't know really. I just wanted him because you had him, at least at first. But then I wanted him, and you, just for sex."
"So you want to take him from me?"
"No! Of course not. I did ages ago yes, but now I just want to be with both of you. To let both of you share me. Use me like you just did. Could you be okay with that?"
"I don't know..." Clair began before Joe interrupted her.
"Baby it's okay, I love you and I'm not going to leave you. If she wants to let us both share her is that so bad? You enjoyed this too, and you know it."
"Well... I did I guess, but.."
"No 'buts'. You enjoyed her pleasuring you. I enjoyed watching her do it, and I enjoyed fucking her. I also think you enjoyed watching me fuck her too. You pulled me into her when we first started too. Now, just sit back on her face and let her make you cum. This time though sit facing me so you can guide me in and watch my cock enter her again and again."