She gives you the chance to reciprocate.

"It's your birthday present," Courtney says, "and I'm not supposed to ask you for anything in return."

She reverses her position in bed, getting on hands and knees beside you, facing the foot of the bed. "But if I just happen to be in a certain position, and you decide, completely on your own, to do something about it, it'd be silly for me to say no, wouldn't it?"

Moving carefully, she stretches a thigh over you, planting her knees near your shoulders so that her hips are over your face. You have a close-up view of her glistening pussy, and you can smell her, and almost taste her.

You can no longer see what's happening lower down on the bed, but you feel her hand on your cock, and then her warm breath. When her lips touch you, you gasp, clutching at her thighs. She slides you slowly into her mouth, making you groan, making the sight of her pussy above you irresistible. You lift your head, nuzzle close to her, and find her clit with your tongue.

She moans with her mouth full, and after drawing her lips inch by inch off your cock, she takes a deep breath. "Oh my god," she whispers, and then puts her lips on you again.

Her tongue drives you wild, and you repay the favor, letting the sway of her hips set your pace as you taste and tease her. She gives you long, slow, thorough strokes with her lips, and you can't think of anywhere you'd rather be than deep inside Courtney's mouth.

Eventually, desperation starts to take hold of you. You moan into her pussy, your motions becoming erratic despite your determination to give as good as you're getting. You hang onto her hips and shut your eyes tight as you sense the fire starting to consume you. She responds by moving a little quicker, licking you with a shade more urgency. This, you know, is her way of giving you permission, of encouraging you to let go, to give yourself to her, to seize the incredible gift she's offering you.

You give one last long moan, almost a cry, and the next time her lips descend on you, you shout and go off inside her. She clamps her lips on you, urging you to swell and burst, making every twitch of your cock a surge of ecstasy. She strokes you, licks you, drawing out your orgasm, taking it all, making you gasp helplessly.

When you think you finally have control of your body again, you return your attention and your tongue to her pussy. Your cock is still throbbing in Courtney's mouth, and she moans around you, spreading her knees a little wider to give you better access. Carefully, she lets you slip free of her lips, and after a moment to swallow, she gasps and groans. "That feels so good..."

Her hair brushes your groin and thighs, and her breath is warm on your cock as she braces herself over you, letting you caress her, riding the pleasure of your tongue and lips. You thrill at the sounds she makes, at the feel of her body responding to your touch, at the desire you feel through the motion of her hips. You ease her along a lick at a time, only picking up the pace when her moans take on an edge of sudden need.

Her hips start to quiver. You hang on, your lips pressed up against her, your tongue on her clit. Every lick makes her cry out, and then she shouts out loud as her hips give a powerful jerk. She thrashes and wriggles and gasps and nearly sings. What she did to you was amazing, but the feel of Courtney going to pieces in your arms, her body eager against yours, is the best birthday present you could wish for.

At last, she subsides, and both of you are sweating and panting. It feels like the temperature of the room has gone up several degrees. Your cheeks are slick from her pussy, and your cock tingles. She sighs as you caress her hips, and she kisses your thigh. One limb at a time, she untangles herself from you, turning herself around with an effort of strength you're not sure you could muster yourself. Then she collapses against you, and her curves nestle neatly along your body. Your arms settle around her naturally, and she sighs. "Happy birthday," she says.