Cover her face

You get right to the edge, pause for a second and then...pow! You erupt all over her, you're sperm spurting out of you faster than you thought it could. The first three blasts hit her right in the face, on her left cheek. You then move slightly and get a few bursts right in her open and waiting mouth. She continues to hold her tongue out and moan as you stroke out the last bits of cum onto her chest below.

You gasp for breath as she looks you right in the eye, wiggles her cum covered tongue around and then pulls it into her mouth and swallows. She then licks her lips and gives you a little smile. She takes a hold of your still hard, but slowly softening dick and gently strokes it as she flicks her tongue around you head. She then squeezes you hard, trying to get every last bit of cum out of you. After stroking a few more times, she succeeds in getting a bit more to ooze out of you and she licks it up and makes sure you see her swallow that as well.

"Mmm, you taste so good. Was that fun?" she asks.

"Uh, you have no idea...." you mutter as you finally collapse on the bed next to her. "That was hot as hell."

"Good, happy birthday!"