Cut all over her face.

As Seth yells cut you grab hold of Kelly's hair and pull her mouth off of your swollen member.
She looks shocked at first but then smiles as she realizes you're about to cover her face.
"Good boy" she purrs jerking your cock as fast as she can "Cum alllll over my pretty face"
You reach down and pull her face as close to your cock as you can.
"Mmmmm" she moans into it,sending vibrations through out your length "I don't want to miss a drop"
Her hand is almost a blur,pumping you back and forth,the sensation of her grip finally too much for you.
You buck and thrust hard as the orgasm rips through you.
Shot after shot of hot white cum fires out of your dick and splatters all over Kelly's face,across her chin and cheeks,splashing her forehead and into her hair.
"OH.MY.GOD!!!" she squeals in delight "There's so much!!!"
With each thrust you coat her in more sticky semen,her whole face nearly covered,it drips from her chin and onto her exposed tits.
"Shiiiiiiit" you cry as the final wave passes through you before slumping back in your seat.
You look down at Kelly who smiles up at you through her cum mask.
"Mmmmm,that was hot" she winks rubbing it into her skin.
"Well Kelly" Seth ask's approaching the desk "Do you think he can handle the pressure?"
"Oh yes" Kelly laughs,sucking her fingers dry "I think he can handle the pressure"