You only have a moment before you know you're going to lose your balance and tumble down from the shower head, and in that time you seize on the only choice you can: Even Debbie can't stop you from falling now, (not that she seems to want to), and all you can do is choose how. Your best chance at not dying or being seriously injured here is doing exactly what she wants, and so you take a breath and jump with both feet aimed at...
...the wind seems to scream in your ear as the adrenaline makes you freeze up, choking back a scream as the walls fly by you falling towards...
SPLRT
With that anticlimactic sound, you plunge feet-first into your ex's waiting pussy, coming to a swift but smooth stop shortly after your head and arms are swallowed up into the now-familiar darkness. Debbie only lets out a little squeal and clenches around you at the sudden intrusion, whereas you feel incredible, overwhelming relief as it starts to register that you've made the landing, safe and unharmed. Hell, yeah! You're incredible! What a jump!
You're not celebrating for long, though, before Debbie lets out a little moan and her muscles start squeezing and shoving you back towards the exit. Your armstretched arms break out into the air shortly, then your head, then chest, and you're held there for a moment sticking halfway out of her and blinking your eyes clear as she giggles down at you. "You made it on your first try! What a talented little guy!"
She half-jokes, half-praises, while petting your slime-covered head and back with two fingers behind you. "And my pussy did a great job catching you." She teases, without waiting for an answer. "Why don't you show some appreciation?" You don't need a lot of explaining to know what she means as her fingers move from behind you to just in front, pulling apart her pussy lips and pointedly tapping on her clit.
After everything else, the task doesn't at all faze you, and you don't even hesitate before leaning forward into your ex's folds and starting to knead, massage, make out with and even nibble from time to time on her engorged clit, all playing expertly to the rhythm she moans and shifts at in response, clenching her pussy involuntarily around your lower half every time she feels you decide to change things up a bit...
After coming down from the adrenaline rush of the high-dive, and in part caught up in the mood from the giantess's sultry sounds and the gentle, rolling warmth of the tub water around you, without realizing when exactly it began you start to find yourself caught up completely in the act. You forget for a little while about your recent loss of height, status, freedom, and dignity, and start just enjoying your hot ex's warm, wet pussy on your naked flesh; her walls squeezing and sliding around your hips, against your crotch, her clit throbbing against your tongue and hands...
Now that you aren't admiring the view while full of fear, looking up at the giantess's torso as she arches her head back, glistening breasts heaving up and down with breaths so deep you almost imagine your lower body can physically feel them reverberate inside her, you find that this time, playing with her cunt is making you extremely hard.
Just then, her breathing gets a little faster and she starts upping the pace.
Her fingers grab you without warning by the shoulders, and start maneuvering your head about her folds, having you lick all over different places while occasionally pumping your body in and out of her a bit. You can't help feeling a little scared again as she gets rougher, but each occasional thrust has the extra effect of dragging your erection up and down the rippling walls, encouraging it to keep going and putting you overall into a very confused state. You can't just will the thing away, but the giantess's growing aggressiveness is like a bucket of cold water shocking you awake.
It's a rude reminder that she wants you not as her lover but as her plaything, and she may not be happy to find out that you've been on the verge of blowing your own load inside her. And considering she's pumping you in and out of her further and further over time, there's a good chance she'll pull you out far enough to show it soon, as you just try to stay rigid and make as straight a dildo for her as you can.