With Only the Tip of a Finger
She lay naked, flat on her back on the floor, thighs jutting out to each side causing tendons on each side of her mound to stretch and raise high as they always would in the sitting lotus position. She could feel the light touch of her pubic hair on the heels of her feet sandwiched against one another and pulled up close to her pussy. 
The stretch felt good and gave her an extraordinarily wonderful sensation of being in a place of full freedom of expression and openness she hadn’t experienced with more conventional ways of yoga stretching. The awareness of this degree of open full exposure heightened her senses to how good it felt to give her muscles and tendons a long awaited stretch along with a sexually stimulating type of sensation she didn’t expect.
As she slowly, almost imperceptibly shifted her crotch back and forth, rolling on tightened but cheeks, she concentrated on finding even the smallest sign of light through her closed eyelids under his tie tied tight around her head. She could not.
Instead, all her senses except sight became so pronounced and intense the urge to sit up and pull the blindfold off became overwhelming. Then just as she started to tense her abs to sit up, she felt his touch on her right wrist, and she was relieved because his touch at least let her know where he was.
She had been with this guy many times, but she still felt better knowing he was following through with their agreement to let him kneel at her side and do whatever erotic touching he thought she might enjoy.
With the wrist lightly in his grasp he started to move it from its resting position to the top of his thigh where he slowly slid the back of her hand through his leg hair until her upturned palm came to a stop under his cock.
He slid his hand from her wrist to the underside of her hand and closed her fingers around his shaft.
“Hold that and don’t do anything else until I tell you to.” He said 
Her only response was an involuntary gasping for air, her chest rising slightly off the floor, and her nipples becoming harder. 
As she held the cock gently in her hand as she was instructed, she knew she disobeyed his orders by gripping a little harder on him when he lifted slightly to a more vertical stance. But she didn’t care, she was not letting go. 
The next thing she felt was a finger tip placed on her bottom lip.
She started forward with her mouth to take the finger in but he pulled it away.
“Don’t do anything until I tell you to.” He commanded. .
He returned his finger tip to her lower lip and this time she let it rest their and didn’t move.
He slowly moved his finger tip down over her chin, then her neck, and then to a spot between her breasts and stopped.
When he started to move his finger again she felt it rising up over her left breast to her nipple and then pushing down on her nipple. She could feel her nipple was as hard as it had ever been and the pressure of his finger was something she had not had done to her and felt strange until he very quickly slipped his finger tip off letting her nipple snap back. As much as she tried to lay still her resistance to react became more of a challenge for every time she felt a sharp snap of her nipple. He continued from one breast to the other until it was almost like he was testing her resistance level to his actions.
Without realizing it she had raised her chest a little with every sensation coming from her nipples and her back was now arched off the floor so her abdomen was fully raised.
His finger tip never left her skin, but seemed to slow almost to a stop before it continued down the center of her abdomen.
It was then she let herself think of the cock in her right hand and her thoughts seem to shift from a hunger to have all of him inside her to all of him in her mouth and she was confused which one she wanted more.   
When his finger continued down over her abdomen the need and yearning she felt for him to get to a lower destination was almost uncontrollable. Then her relief was all consuming when she realized his finger was almost in her pubic hair.
His finger stopped, resting on the hood of her clit, and then it left.
The next sensation she felt was the tip of his finger sliding slowly in an opening of her pussy made by her legs stretched so far apart, then stopping just inside her, and leaving again, then followed a second later with his entire finger pushed deep into her.
Right when she thought that was what was going to be repeated, his finger pulled out of her and she felt a wet finger being rubbed over her right breast and nipple.
She then felt his finger leave her right breast and return to deep inside her followed by the same soaked finger on her left breast.
With expectations of feeling his finger again in her pussy, she squeezed his cock even harder craving to feel it all over again, when suddenly she felt his other hand on her left hand pulling it down between her legs.
Then she heard him say, “Now rub your clit while you rub my cock and I will finger fuck you, and don’t you dare cum until I say you can cum.”
By now her muscles had reached a point so tense, her entire body from her shoulders to her feet had lifted from the floor.
She could feel the hardness of the floor press against the back of her head as she strained her neck relieving much of the pressure on her shoulders, yet with every attempt at trying to maintain a manageable level of stimulation while rubbing her clit, she was hit with another wave of psychologically pleasing thoughts from the cock she was now sliding her hand over along with the physical stimulation she had no control over of him fucking her with not just one finger, but his entire hand.
Finely, when she knew she was beyond caring if she had permission to cum, she heard him say, “Cum and cum now.”
As she came she was totally unaware of anything else except the sound of splashing from the slapping together of body parts and the slipping of her hand at a faster pace on a cum soaked cock.
As the orgasm subsided she was completely overwhelmed by the degree of sheer fulfillment that came over her. 
Then just when she thought both had cum and all was going to be calm, he leaned over her, pulled his fingers from her pussy, and with both hands messaged her entire abdomen and breasts with a mixture of his cum that had landed on her and the fluid dripping from his hand. 
Both of them still turned on and not yet over the extreme reaction their bodies were exposed to, he let himself slide over until he was fully on top of her, let himself sink in-between her legs, and she slipped the blindfold off her head.
Knowing how hard the floor must be for her and how much she loved to ride him from above, he reached under the small of her back, rolled to one side, and pulled her over on top of him. Then while holding the back of her head in his left hand, he placed his right hand on her ass and tightly squeezed her tight against him, as if  to say, I want to feel all of you for a long time and I’m not letting you go. She answered with reaching down between their bodies and worked him up inside her. It was far from over.