"You're going to have to work for it"

"Yes David, anything to get that cock in my mouth!" Jennifer eagerly agreed with no further information.

"Good. Since you were so eager to comply, I'll allow you to blow me for 10 seconds, but after that, you're going to have to earn it. Especially if you want my cum, that's gonna cost a lot. And the clock starts... now!"

The end of your sentence sent Jennifer flying to her knees in front of you like she was shot out of a cannon. She tore at your pants like a predator on prey. Ferociously she freed your rigid member from its prison and immediately crammed 1/2 of its length into her mouth. As she did you could almost see a wave of relief flow over her, as though she had been in the desert for 40 days and your thick cock in her mouth was the water for which she was ****. She hummed in delight.

The sight of this whore on your cock was almost too much to bare in and of itself. In the past she would never even look at you. She thought you were a loser. She thought you were the ugly duckling of the family. Now she had brush burns on her knees from diving to the floor to suck your cock.

"9" you counted down

Spurred by the tangibility of her deadline, she pistoned her head 2 more times forcefully on your cock, attempting to take more in her mouth. Unbeknownst to you, she's never done more than put the tip of a cock in her mouth before. The unfortunate side effect of the beautiful never having to work for anything. But under the spell of Blowjob Universe, she threw caution away.

"8"

Her attempts to throat you deeper were thwarted by her untrained gag reflex. Her entire body shuddered while she made uncomfortable wretching sounds.

"7"

Hoping lubrication would help, she extracts your cock from her lips and begins taking long, flat licks with her tongue from the base of your scrotum all the way to the tip of your penis. She haphazardly slurps the whole thing, getting it as wet as possible.

"6"

With a deep breath she launches herself back onto your cock, taking 3/4 of the length into her mouth, finally poking its way into her throat. She applied herself to the task of **** on your cock more than any other thing she's ever done in her life.

"Halfway done Jennifer"

Attempting to push your cock deeper she gags and wretches much more intensely than before. Tears start to stream from her eyes, her muffled screams doing nothing to dissuade her from continuing.

"4"

She makes little progress, but her watery eyes and mascara have made a roadmap out of her face.

"3"

Still stuck at the 3/4 mark, she grabs you by your ass cheeks in an attempt to **** your body weight forward, pushing your cock deeper into her. It slowly begins sliding further.

"2"

A coughing gag drives 1/2 a pint of drool out of her mouth, adorning your cock and dripping down in long strands from her chin. She's so close.

"1"

She gives a frantic push, but the real help would be your hand on the back of her head, slamming her face into your crotch. Her hands flew to the side, her back arched in a torturous sounding gag, and her body went rigid. A combination and spit and stomach bile poured from between lips, her coughs and gags even driving fluid from her nose.

"0" you say sternly while violently pulling her head off your cock, forcing her to arms length. Her once pristine face was now a chaotic mess, her skin soft reddish-purple tone, coated like a mask with tears and spit.

"You've never done anything like that with my brother Mike had you, you little slut."

Still gasping, she ignored your question and made her own inquiry, "Please... (gasp) David... (gasp) can I... (gasp) have more? (gasp)" She continued heaving, kneeling like a **** with her hands sitting between her knees.

Wondering how far this Blowjob Universe hex would push your sister-in-law's desires, you pondered your next move.