You grin as you reply, saying:

"Well, this a surprise to be sure, but a welcome one! If I'm fully honest, the biggest part of my giantess fetish was the fantasy of making a gorgeous giantess feel good as I'm inside her...I can describe to you later...the kind of content I found most... appealing if you so wish."

Your girlfriend gasp, before squealing happily. She brings you in a flash into her face, where she starts to give you a barrage of kisses. In between them, you can hear her saying:

"Oh I love you...love you...love you! Oh my god, we...are going to...have so...much fun! Let's get...into our bed, my love!"

It is when she says those final words that she stops, leaving you a few seconds to catch your breath, before she walks toward her bed. There, she lowers you down, allowing you to sit on the mattress. She then says:

"Now, strip quickly! Mmm, can't wait to show you my body!"

You nod, and start stripping down as quickly as possible; in but a minute you're completely naked. 

And not too soon, for at the same time she strips herself as well. 

My god...yes...your giant girlfriend...all in her naked glory. Large tits, round ass, and thick thighs...what more could you ask for?

She plays with her boobs, making round motions with them. She then giggles:

"Love what you see? Hehe, no need to reply: your little friend down there is more than enough."

You look down in a second: you knew you were rock solid, but you were still surprised that she was able to see it. You chuckle, and reply:

"Well...glad to know my member is big enough so that my giantess can notice it!

"Hehe, it sure is! But we are not yet ready...let me...position myself properly..."

Your girlfriend replies before she starts moving.

The sight is most gorgeous: a gigantic lady, as big as a building crawls across the bed before she lays down on her tummy. She then spreads her legs wide open, allowing you a most wondrous sight: her dripping and excited womanhood lies clear in a straight line from your position, while the big and jelly-like cheeks of her ass shake still, her clean pucker twitching. Abigail looks back, smiling with an excited blush. She says:

"Now, I'm ready. Tell me, my love, which way do you prefer: do you like my tight and gorgeous pussy, or prefer to delve deep inside my ass? The choice is yours, I won't judge: either way, we will have fun."

As she speaks, she spreads wide open with her fingers her pussy, before doing the same with her ass.

She's leaving you the initiative regarding which kind of sex you two are going to have. And well, what is your preference? Do you prefer giantess pussy or ass?