It has been a week since you arrived here and began your relationship with Addison, and it has been quite an energetic time: never before had you done so much in such a space of time. 

First, you are fully accustomed to living alongside one another, helping each other learn the better ways to deal with many situations your small size brought into your interactions, from how exactly you would have a bath to food. Speaking of food, the hyperborean cuisine, although alien had many similarities with Earth's food, so it was easier than you had envisioned.

Secondly, you got to know more about the more traditional routine of your girlfriend, learning that she was a college student, beginning her career as a future engineer: you realized that she was rather excellent with math, a topic that you, although not bad, were never into that much. Meanwhile, your personal experiences and passions regarding more humanities-focused studies like History and Political Science brought many interesting topics that your giantess enjoyed learning about. 

During most of the days of the week, she would spend it at classes, leaving you in the apartment alone since she didn't want to bring into potential risks; this was no trouble, for it gave you plenty of time to get used to the many facilities incorporated into the furniture and walls to allow a tiny such yourself a comfortable stay despite the size differences. It was also a good time for you to learn by yourself local stuff, like languages and television. 

When your girlfriend returned, however, the chill context you found yourself in quickly changed to a more...lustful one. Addison always came pent-up, desiring nothing more than to feel you against her throbbing dick, a situation you were always eager to help and enjoyed, while further cementing your bond with each other, learning what each liked more in bed. There were times when Addison was feeling in a more submissive mood, letting you have complete freedom on where you could go to pleasure her, from massaging her nipples all the way to gently biting the tip of her sex. Other times however she wanted to be more dominant, either feeling squirming beneath her balls as she rode you cowgirl-style, or rubbing you up and down her hard shaft before flooding you with her cum.

Afterward, you either watch local television or read one of the many novels your girlfriend had in store as one of her hobbies, or just chatted more about how each other's day had gone. It was through these later chats that you began to learn about some of the close classmates your girl had managed to start forming a close friendship with, and they were eager to eventually meet you. 

Lastly, there were some nights where you either felt excited enough to try another round of sex, while others were just content to cuddle together before slumber.

This was the overall trend of the week, one which was to remain unchanged for the foreseeable future...at least, that was what you thought.

It was the late afternoon on the late Saturday, a whole week and nearly a day since you had arrived at your new home. You were reading a book on your girlfriend's bed when you heard her coming into the room. She had decided to take a short shower after returning from a short trip to a store to refill the food reserves of the week: it had been a rather hot day, so she needed to clean up all the sweat she had accumulated.

So, when she came into the room, she had nothing but a towel covering her, and combined with her cute glasses, it made her look rather sexy. 

You playfully whistle, while saying out loud in a teasing tone:

"Man, lucky is the man who gets to have such a hot and special cake regularly, right?"

Addison blushes, enjoying the compliment that you threw at her. And once she's close enough, she brings one of her fingers to her face, before saying in a playful tone:

"Oh, you silly; you're that lucky man!"

You both laughed a bit from the interaction before your giant girlfriend sat down beside you; the fact that she was still covering herself plus the extra blushing on her face were signs telling you that something...was going to happen.

Your girlfriend grinned while grabbing you with her free hand, bringing you to her face. There, while rubbing you against one of her warm cheeks, she began to speak, saying:

"Ah, I still can't believe how lucky I am: on my first try, not only got a cute guy but also one eager to comfort me, to enjoy me and my special condition; a few times I have feared this all has been a most lovely dream, one I am yet to wake up from."

"Awn, don't you worry dear, this is no dream at all: this is real, I am real," you reply while caressing your giant partner's face.

She appreciated the gesture, giving you an energetic kiss before she began to move backward in the bed. Meanwhile, she continued speaking, saying:
"I know, which makes this all the more exhilarating!"

For a brief second, she paused her speech, bringing herself to sit near the top of the bed, having the wall to support her: this was a common position she used when she wanted to have sex with you. As she playfully dropped her towel, she kept speaking, her tone developing a more excited and lustful tone:

"For you're likely aware, my beloved Paul, that I love my dick: ignoring the initial fear of rejection by any potential guy that I might find, I enjoy my cock, I enjoy playing with it, the experiences I get to have with it...are those that only futa girls like myself can ever experience..."

She brought her other hand down, beginning to stroke her sexual organ, making herself moan in pleasure while she was getting closer and closer to the crux of the matter. She said:

"We both have been...at this...for a lovely...week already...and so...I am confident...that now...you are ready...to experience...my most profound fantasy...ohh..."

And once her cock was hard enough, she brought you there and...Pushed you slightly inside, legs first. Right now, your upper body remains free, but it didn't take much imagination to realize how easily she can pull or push you inside. From your new position, you manage to hear your beloved's final revelation, as she pulls her hand away, to be slightly calmer to speak easier. She concluded, saying:
"To pull you inside, all the way down my cock, to feel you squirming and licking inside my shaft, to make my balls into your "bedroom" for long periods; this and more has always been my most profound desire, ever since I wanted a tiny guy such as yourself. Of course, you are my boyfriend, not my toy, so you will always be free to ask to leave my insides wherever you desire...and by extension, the freedom to choose to let me experience my dream. Paul...would you...allow me...this? Allow...my cock...to "eat" you up?"

The way she's looking at you, a mix of lust, sincerity, and anxiety, tells you that she means with all her heart what she's saying. She wants to try this badly, yet understands if you might not be willing; no wonder that despite how close you two quickly grew to each other even on the first night, she waited until now to ask you this. For only now she could count on your willingness to try this intense experience.

And frankly, who are you to disappoint her? A part of you expected she would one day ask this, for it was the main content you had watched back on Earth regarding giant futa girls; cock vore it was called. Not only that, you are curious about what the experience is going to be like in the flesh, so there is that.

With all this in mind, you look back straight into your beloved's eyes, replying with smiling, saying:
"Yes, my love, I would love to: I had always expected this to eventually happen, and I can see how much you want this. So, here I am, ready to go down your "love tunnel", my Addison."

Then, you lean down and kiss the tip of her cock, a further gesture of how willing you are.

Just like the first time you had sex, she reacted by blushing a lot and closing her eyes; she even almost tears up a bit, of how happy she is for you to be so eager to try. 

She blows you a kiss, before bringing one of her fingers close: as she leaves it for the moment hanging right above your tiny body, she says:
"Then, my beloved, let's us...begin. Time for you to go down into my depths. Make sure to squirm and lick energetically as you do so, hehe."

Immediately after, her finger comes down, gently pushing you down, and making her moan as she feels you getting fully inside her erected organ. Then, she starts to pull you deeper, moaning all the while.

Surrounded by flesh that twists and shivers all around you, with all the light from outside filtered through her skin, feeling as if you had been just devoured alive by a hungry monster; this and more are possible reasons for this whole ordeal to be... intense in a terrible way are plenty, giving full credence to Addison's caution regarding the attempt.

Yet to you, those reasons don't apply: for you're right now inside your girlfriend's most special place, a place she had desired for the longest time to feel you in. And, you reason that this is not that different from being inside a vagina had your girl be more normal, so there's is that. 

Therefore, you remain calm as the walls pull you ever deeper, focusing on the lovely sounds your girl is making, visualizing her gorgeous face in the forefront of your mind: she likes this, but she could feel even better.

You began to squirm side to side, moving your arms and legs to attempt to stretch out the fleshy walls of the shaft while bringing your tongue to bear.

The effects of your actions are immediate and strong, for Addison begins to moan louder, while her cock begins to shiver harder. You hear her saying:
"Yeah...yeah...yeah! That's Paul...squirm...lick...stroke the insides of my shaft...get ready...for I'm...getting closer...closer!"

True to her words, her cock begins to shiver as hard as possible, while a flood of precum surges strongly around you, clear signals that she's approaching climax. Not wanting to be left behind, you began to move your hips, rubbing your cock against the walls: in a way, you're fucking your girlfriend, or as close as you can get within a futa's cock.

"Mmm...That’s it...my love...fuck me...fuck me from within...let's cum...together!" your giantess cries out in ecstasy, right before a flood of white, cream-like fluids surge with a mighty stream from depths yet "uncharted", surrounding your whole self and pushing you upwards.

For a few seconds, you thought it would be strong enough to shoot you out, yet despite how strong it is, its short duration proves that is not the case, leaving you just a short distance from the exit. It's not like you're currently interested in leaving this place, you were just curious about what it would be like to experience intimately an orgasm of your dear.

And as you know already, after she comes, her hardened shaft begins to soften, fully closing your exit as the tunnel dwindles above you: with no other alternative, you go further down.

You hear the pants of your girl before you hear her asking:
"Are you...okay...dear? Did you... enjoy the...experience...as I did?"

"Yes...It was...awesome... the best sex I...have had...in a while..." you reply, panting as well, since you came at the same time as her.

You manage her giggle, happy to know that you enjoyed the experience as well. Then, she asks again:

"Now...I'm in the mood for a nap...are you eager to know...your new bedroom...dear?" 

Instead of words, you just playfully lick her shaft, sending shivers all around you.

Your girl giggles again, concluding that you reply in the affirmative. Then, the walls around you began to shift again, pulling you deeper and deeper. You remain as still as possible, wanting to give the least possible resistance to your girlfriend's efforts.

This goes for a few seconds until you feel as if your legs meet a fleshy valve of some kind: soon enough, your whole body enters a small chamber, mostly empty except for some cum that pours out from tiny holes all around you. It seems that you have arrived at your ultimate destination in your journey inside your giant futa girlfriend's sex. 

You only wonder at the feeling and the very notion of being inside a testicle for brief seconds, for you can feel how the warmth of this entire place affects you, which in combination with your previous exhaustion is driving you closer and closer to sleep.

With little choice, you take a fetal position and close your eyes. As you began to drift into unconsciousness, you managed to hear your girlfriend speak one last time this lovely night:
"Thank you, Paul...for everything...I love you."

Then, darkness...until the next sunrise.

This might have been the beginning of new interactions, but perhaps some other important events in your new life happened shortly after, right?