Yes, over her face

The orgasm is coming on too quickly and who could really stop such an eager and beautiful nympho from doing what she's doing. So instead you just grunt an encouragement at her and bring your hands to the back of her head. Helping her to pick up speed. Her lips getting to about half way down and her small hand working the bottom half of your shaft. Her head quickly bobbing up and down. Tongue flicking all over your head inside of her warm wet mouth.
She brings her other hand from your leg to your balls, gently massaging them in time with her other movements slightly higher up.
You can't help but be impressed by her skill and coordination. She is truly wasted doing whatever she does and with whatever deadbeat partner she has. She's truly gifted at this. She doesn't miss a beat and is completely focused on the task at hand, and in mouth. Her eyes occasionally flick up towards you seeking your approval almost. You oblige by letting her hear your soft grunts and moans as you edge ever closer to orgasm.
You're now on the very cusp of orgasming so you make a split second decision. You grab your cock from her hand and pull it out of her mouth. Jerking it off rapidly yourself as you hold it in front of her face. She's unsure what's happening and glances up to you. But after a moment of confusion she realised and locks eye with you whilst opening her mouth wide as close to the tip as possible.
As she does this you begin to orgasm and spray your thick warm cum over her face. The first few strands shooting up to her hair and covering everything in between. Her eyes closing instinctively as you spray your load over he face, some landing in her mouth which she instinctively swallow, whilst other bits already begin to drop onto her still clothed body.
You push the tip of your dick into her open mouth and she obliges you by licking and sucking the last few drops out before you pull back and sink into your chair.
She takes a moment before sighing loudly and saying; "wow... This is a lot..." whilst gesturing to the covering of her face. You can't help but admire your handy work before she begins to slide some of it towards her mouth.
After she's cleaned up the worst on her face and made sure she can see properly you grab her wrist.
" Leave the rest," you half suggest half instruct. She suddenly stops her movements and just as you think she's about to offer an objection she nods slightly then stands. A second later she straightens out her outfit and then promptly leaves your office.