Turn her around and let her ride you.

It takes almost superhuman willpower but you manage to stop yourself climaxing.

"What happened?" says Christy "I thought you wanted to cum with me."

"I did" you say, slowly withdrawing from her "but I want to see your face when I do"

"I'm not sure I have the strength to keep going," she admits "that was the strongest orgasm I think I've ever had and my legs are already feeling almost too weak to stand."

"That's O.k." you say, pulling her upright, "I can hold you up."

You turn her body to face you and, as you do, you make her so light (or yourself so strong) that you can hold her up with only one arm. Keeping you right arm behind her you draw her close, crushing her large breasts against your chest, and then lean in and begin kissing her passionately. She returns the kiss with equal ardour. You move your left hand down her body and begin to caress her butt, which she wriggles appreciatively. You still totally erect cock rubs up against her belly.

You continue like this, never needing to 'come up for air', for a while until you feel that she is ready for more. You break your kiss and Christy looks at you. "So how is this going to work?" she asks.

"Like this" you say, moving your hands to her hips and lifting her off the ground.

"Wha!" she gasps "How are you...?"

You move her warm hole to the end of you shaft and then begin to slowly lower her onto it.

"Ah" she gasps, grabbing you shoulders and wrapping her legs around you and using them to draw you in deeper, softly groaning as she does.

"How's that?" you ask, looking up at her as your length is buried inside her, sliding you hands under her butt.

"OH!" she sighs "My pussy really loves your cock. Having you inside me feels so perfect."

"You know what's perfect?" you say, looking straight at her naked wet breasts that are at face level to you now, "These titties"

You move your mouth to her left nipple and begin to suck on it making her yelp, writhe and then moan as your cock moves inside her.

You keep kissing her breasts and sucking on her nipples causing her to make appreciative sounds until you feel her start pushing on your shoulders and loosening her legs.

Taking that as a sign that she wants to start riding your cock you slide you hands back to her hips and then slowly lift her up, with drawing her up your shaft as she pushes against your shoulders until she stops and begins to tighten her legs as an indication that she wants you to lower her back onto you. As your face comes level with her breasts again you go back to kissing and sucking on them.

You let her control the speed at which she rides you and that speed gets increasingly quicker until she stops just indicating and yells "FUCK ME John! FUCK ME HARD!"

You move her up and down you cock as fast as you can, each time trying to thrust in deeper until she yells "I'M GONNA CUM John! CUM WITH ME! CUM INSIDE ME!"

With one final thrust you bury yourself deep inside her. You look up at her face and you see her looking down at you. As your eyes meet you feel her cum and you do the same.