Yes

Clair sat still for a while not saying anything. She was clearly thinking so both Dan and Helen left her to ruminate. Dan still had his cock in Helen's pussy, so as Clair continued thinking he again began sliding his shaft in and out of his wife's sister.
Clair's eyes followed his shaft in and out of her sister's spread slit, and without a word she reached out and touched them, her fingers spread, caressing Helen, either side of Dan's shaft.

She shuddered, then looked Dan in the eyes for a few seconds before glancing back toward Helen who's eyes were closed. It was obvious to Clair that Helen was loving the feeling of Dan's cock in her, and she admitted to herself Dan looked hot thrusting in and out of her sister. She looked up again, and keeping eye contact with Dan, moved herself backward and straddled Helen's face as he'd requested. She lowered her pussy to her sister's mouth, and immediately felt a tongue dart into her depths. Helen was a natural at licking pussy, and sucked Clair's clit into her mouth even as she thrust her tongue in and out of Clair, just like Dan was doing with his cock in her own pussy.

Clair closed her eyes and leaned back, accepting the new situation. She and her sister were now sharing her husband, and themselves in a new way, a way she'd never dreamed of, but now that it was a reality it was right and it wasn't long before she felt the familiar sensation of orgasm. As Helen licked Clair to the precipice and beyond, Clair couldn't help but moan loudly and deeply, thrashing her hips around on her sisters face. Seeing his wife cumming was too much for Dan, and he lost control, fucking Helen as fast and as hard as he could as he climbed on her, trying to drive his dick in as far as it would go. Within seconds, his vigorous **** had driven her over the edge, and he loosed his seed into his sister-in-law as she too joined in the combined bliss he and Clair were experiencing.

As Dan laid down beside Helen, Clair managed to only slump forward, her face resting on Helen's thigh. She was only loosely aware of Dan's cum seeping from her sister, and it wasn't long before the three were asleep in Helen's bed, their bodies entwined.