You could only smile excited, as you replied loud and clear:

"Sure, I'm as ready as I can be: can't wait to see my new girlfriend naked on our bed!"

Addison was caught by surprise: a part of her wasn't expecting you to be so eager. Yet, she blushed excited, as she delivered you an intense flurry of kisses while saying:

"Thank you, thank you, thank you! You're the best guy ever, Paul!  You've no idea how much I've wanted to try having sex with a tiny guy! Now, take those clothes quickly, my penis is getting hard and hot as it is already!"

"Your wishes are my command, my fair lady. Let's go!" you replied as soon as she allowed you before she left you down the bed to strip down.

In a matter of seconds, you find yourself naked, with your clothes all piled up in a single bunch to allow Addison to take them somewhere else.

It was the moment you turned back around, that you got a majestic sight: there she was, your giant girlfriend fully naked, with only her glasses and socks still on, a most erotic combination. You whistle to her, before complimenting her:

"My god, I'm quite the lucky guy! Giant nerdy redhead, count me in!"

"Hehe, I appreciate that you find my "nerdy" look sexy, love. Now, what about this? Is it discouraging or not?" your girlfriend replied, before pointing with a finger to her crotch area.

There it was, fully open and free for you to witness: the pair of cock and balls she had instead of the usual female sex. Other guys might have found it shocking or worse, repulsive; but not you, for you knew that what mattered was that you had a gorgeous, giant girlfriend. And so, you replied earnestly:

"He, it only makes my gorgeous girlfriend even more special! Let me get a closer look, I want to see how I can adapt my tactics for the occasion."

You could see that your futa girlfriend couldn't help but let go of a few tears of happiness: this was it, she had managed to find the kind of guy she always wished for, the one who would find her appealing despite her special characteristic. With her doubts fully vanquished, she smiled and said excitedly:

"Sure, let me get you dear! I need to position myself properly on our bed."

One of her hands then went and grabbed you firmly yet gently, taking the opportunity to deliver your pile of clothes onto the desk nearby. Thus, with that taken care of, you two were now fully free to enjoy a wild time together. 

She quickly moved across the large bed, turning to lay on her back, with her legs wide open. Once she was fully set, she dropped you near her hard penis, where she told you:

"In other situations, we might have started by you playing with my nipples, dear. But as you can see, my "friend" down there is quite hard and hot already, and she would appreciate to feel your caresses immediately."

"Ok doki!" you replied, in a quirky tone that made your girl giggle. You then approached the erected organ, touching it, feeling it harden and warmth. You look up to the very top of it, and as you spread your arms wide as to hug it, you commented:

"So, this is my girlfriend's penis, huh? Looks quite girly to me."

"Pfff, "girly"? That's one description I never imagined I would hear someone describe a penis that way, much less my potential boyfriend! Tell me Paul, what is so girly about my cock, huh? You think that because it belongs to a girl it cannot get to play rough with you?" your giant lover asked in a playful yet curious tone after you made her chuckle hard for a second.

"Well, to be honest, the only point of reference I have was my own and that of images, nothing more since I never interacted with men in this way. Yet, I can tell that this: your cock is long yet "thin", soft to the touch but with an inner hardens like no other. Even the very top looks from down here more like the tip of a long clitoris, a form-fitting for my lovely girlfriend! And now...I get to deliver to you that cunnilingus that you deserved." You replied, explaining quickly your sincere opinion as to why you described her cock to be like that, an ultimate flirt that was the "cherry on top" to get your girlfriend fully hard, ready to your touches and licks.

The moment you got to action, any potential doubts that might have lingered in some recondite part of your mind (any part that would be grossed out about the association of cock and male) vanished, as the sounds of moans coming from your giant girlfriend were filling every fiber of your being: this is it, I'm giving a very special "cunnilingus" to a very special girl.

You moved your hands in round motions, while slowly yet steadily climbing higher and higher; all the while, you lick here and there, keeping special attention to the sounds telling you where she likes it the most. The entire landscape trembles, as Addison shakes in enormous pleasure. In the brief seconds, you take your sight away from your beloved's cock, you can see her playing with her breast, while she begs of you:

"Yeah, yeah...keep going, dear, don't stop...yeah, your tongue, your hands...make your giantess feel special, make the fantasies of your girlfriend come true..."

Her words only inspired you to try reaching further heights, both literally and metaphorically, as Addison is not the only one having fun in here: your own cock has quickly become hard and hot, and as the moans of your girlfriend reached higher and higher pitches of pleasure, it's becoming harder for you to focus on your job, as the pleasure provoked by the sounds combined with the erotic smell of this entire place is overwhelming your senses.

It soon comes to a point where you can't focus on anything but pleasure, making you innately start to grind your sex against the flesh of your beloved. At the very hot top of the dick, where a quivering hole expands and closes quickly, and where the fluids of precum come out flowing, you being to "fuck" your girlfriend for the first time.

"Yeah, that's it, move those hips! I am happy that you're so excited to start rubbing your tiny cock against mine, this means that you're enjoying this as well! Keep going, I'm getting closer....mmmm!" Addison says in between her moans of pleasure, commenting on your latest action.

And as she says, she's indeed getting closer: her penis is starting to shake faster and harder, a clear signal as to what is to happen soon. You smile, as this means that you're going to climax together, as you are about to reach your peak.

And soon enough, like an erupting volcano, your girlfriend's cock shoots out a ginormous flood of white, cream-like cum while she makes the loudest series of moans you've ever heard in your life up to this point. At the same time, you cum as well, shooting out your seed against the red flesh of the top of your girlfriend's cock.

You lay there, quickly grabbing to the quickly shrinking appendix, with the foreskin quickly shifting you up until you find yourself panting exhausted right at the very top of it all. Alas, you don't last long in here, for your girlfriend grabs you and brings you to her face, where she gives you a nice, deep kiss. Once she pulls you back and leaves laying between her breasts, she speaks:

"Paul, that was awesome, it felt just as good if not better than I imagined! ... And, also...thank you, for being so eager and willing to try it with me; you've no idea how much I dreaded the possibility of getting rejected by any tiny guy I might bring in. That fear alone keeps me from trying, only for it to vanish with the very first guy I got: you. My lovely new boyfriend."

You stand up a bit, getting close enough to press yourself against her lips once more. You have another passionate kiss, before you reply, in an equally eager manner:

"And I am happy as well: I never imagined that my first giant girlfriend would be a futanari, yet that only makes what we have more special. I will be able to do things with you that I wouldn't be able to do with any "normal girl". I love you, Addison."

Your girlfriend giggles, before she asks:

"Well, this was very nice, but I believe that after a short nap, it is time for us to prepare some proper accommodations for you. Doesn't that sound nice?" 

You agree, nodding to her as a reply. You then return to her cleavage, making your girlfriend giggle as she finds it both cute and funny that you were so quick to choose such a place as your resting spot. You wish each other a good nap, before in unison closing your eyes and letting the mounting weariness brought up by the intense fun leave your minds pitch black.