I'm a little of two minds about this.
On one hand, I want you to be frustrated and wet and panting a little because you want me inside you, you need to come, flushed, and with a little curl of dark hair pasted to your temple because you're hot and anxious...
On the other hand, I'd like you to have already come, say, twice. Enough to be relaxed, your mouth soft and warm, your eyelids heavy, blinking slowly, but still aroused, still rolling your hips slowly and making very soft gasps and sighs as I pet you between the thighs, just the pads of my fingers slipping over you, slipping in your moisture, dipping into your cunt just a little, and rolling your clit like a marble in oil...
Either way...
Take my cock in your hand. I'll like that right away. Just the feeling of your small, slender fingers wrapping around me, confident, easy. You can bury your face in my neck, but keep your mouth open, so I can feel you. Just move your hand. Don't let your hand slip yet, and don't move much, just stroke. Harder at the top, lighter at the base. Lick my shoulder. Lick my neck. Breathe into my ear. Don't tease me. This is pleasure, not foreplay. Listen to my breathing; I won't be able to help a catch in my breath at the top. Don't speed up for a long time. If I get a little impatient, stroke me a little harder, but not faster. Not yet. By now the tip of my cock will be slick and wet, run the ball of your thumb over the fluid, let your hand start to slip a little at the top of the stroke, lick your thumb so I can see. Go back to hard, slow strokes.
I'll like this for a long time.
Eventually I'll start stirring around, my hand will start moving on your back more restlessly. I'll probably feel you smile if your mouth is open on my neck. Kiss your way down my belly, I'll probably have a hand in your hair, maybe catch your earlobe between my thumb and forefinger and rub it like a lucky coin. I'll want to see you, so keep your hair over one shoulder, and, seriously, no fuckin around, in one motion close your warm, wet mouth softly on the head of my cock.