Muriel was becoming conscious of the wooden floor beneath the cushion, but it wasn't unbearable just yet. Was barely anything next to the sounds he was making, the feel of his fingers ghosting over her shoulders and throat. Barely anything next to the look on his face, jaw slack and lips parted, eyelids fluttering.
Muriel continued, listening to the sounds he was making and varying her technique accordingly. She loved the little gasps and the semi-formed words he made, and she wanted to hear him like that - helpless - as much as possible. He seemed to like the feel of her finger, too, so she stroked him in circles, wishing she could slip her finger in and see what that did to his cock, but she didn't think she quite had access in this position.
She slipped her hand around him again as she pulled her mouth back, flicking her tongue out one more time to tease him before she spoke.
"Need to move. My knees, and I want to hear what you sound like with my finger in you."