All over her face

With a quick violent motion you flip her over to face you and straddle her around her chest, sitting just above her tits. Her arms are pinned under you, preventing any defense from the steaming flow of cum about to splatter her face.

"Please, please, not my face!" You stare right in her eyes, ignoring her pleas like a machine. She preemptively starts to flinch and twist her head away, trying to minimize the amount of ejaculate that ends up glazing her. With a merciless sharp tug, you grab the back of her head by the hair. This forces her head to angle 90 degrees with the rest of her body, placing her face squarely in front of the cannon you are about to unload on her. She attempts to writhe and struggle, but the pain it causes keeps her from escaping in any way as you continue stroking your cock just an inch from her mouth.

"Please, don't! Stop! You can't. It's disgusting" Her panicked pleas heighten your arousal, causing you to stroke faster, nearing you to the edge. Her struggles continue, but to no avail.

"You're **** m-AAAGG-AAKK-GUH-AAKK" she begins to **** as you shoot a thick, hot stream of cum directly down her throat. She continues gagging and starts to turn pink as you unleash a torrent of cum all over her face. Long sticky ropes of cum cover every inch of her, hitting her in the eyes, forehead, nose, cheeks, now-closed mouth, and even sailing into her hair. Each jet causes her to flinch likes she's been shot with a bullet, her eyes streaking with tears, her body feebly flailing to escape, each humiliation adorned with words from you like:

"Take it you fucking cumslut"
"You fucking love it you little whore"
"I'll bet you wish I came in your ass now"

With her whimpering and crying, blinded by the mask of ejaculate, you decide to silence her by forcing the full length of your cock down her throat, still gripping her head to jam it as deep as possible. Her chokes cause spit and drool to eject violently from her mouth and nose, mixing with the already humiliating cocktail of tears and cum coating her face.

"This is your purpose in life. To be a cum-covered slut with my cock buried in your throat."

You extract your cock abruptly, followed by her gagging and gasping for breath. While she does so, you slap your cock on her face a number of times, each one making a wet slapping sound from all the cum. She was too cum-drunk and short of breath to even resist.