Hoping that Goku wouldn't just pop out of nowhere with some huge dead animal, Bulma brought her fingers to her butt-hole where the itch was at its strongest.
One finger landed on top of her hole, while the other landed straight on the 'itch', you. To be specific, it landed straight on your head, pushing it closer to her hole.
Alas, that way you couldn't see what was about to happen, albeit you had a bad feeling.
As a matter of fact, Bulma began scratching the area. Her nail slid on your the back of your head, causing you pain, but luckily not making any actual damage than a simple pain.
Obviously, you tried to fight the finger back, hopefully grabbing Bulma's attention in the meantime, but she just regarded it as an annoyingly insistent itch and began scratching more vigorously.
Her finger applied pressure on you, pushing you closer to her butthole, to the point where your nose was caught in it. Your nostrils were assaulted by a strong stench, and you desperately tried to push yourself back, but as you acknowledged, fate wanted to show you what happens when you mess with space and time.
In fact, the gate to Bulma's insides opened slightly, enough to claim your hands inside.
Oh no...
You tried to pull yourself back out, but the force wanting to push you in was far stronger. In fact, it eventually caused your body to go completely limp against the giantess' orifice, which first engulfed your arms; your head followed as Bulma entrapped you from chest up into her rectum.
It smelled obnoxiously in here and felt squishy and hot; the rectal floor felt slick.
You tried to feel something to grip with your hands so that you could push yourself out of this mess, but there was nothing that could help you as Bulma scratched your lower body inside of her lower body.
She came to the point where you were stuck from knees up inside and finally declared herself satisfied. Her itch was gone, and she became aware of a pleasant sensation.
Blushing, she sat back down, unawarely pushing you further inside of her. She didn't even need to push the rest of you inside, her anus took care of that: it chewed on you as if it was a hungry, ferocious beast wanting to feed on you.
It dug its jaws into your flesh and its insides squeezed each time it did until nothing but your feet were left to prove your existence to the outside world. But then, the last proof you ever existed disappeared inside as well as you were fully taken inside of Bulma's rectum.
You tried to wiggle around, but the pressure around you didn't allow you to, and each time you tried to move, the muscles would react by clamping down on you, smothering your attempts to at least get in a more comfortable position.
This stank, you thought, and not only because of the hideous smell that lingered in this foul cage.
As for Bulma, she patiently waited for Goku to return, giggling every now and then because of a tickling feeling down below. She wondered what was going on with herself today, first an annoying itch and then this.
It sure was weird...
"Hey Bulma!"
The blue haired girl snapped to attention as she noted a kid with spiky black hair, a blue training suit, a tail and a naive smile on his face.
Also, he was carrying a giant fish with no effort at all.
"Goku!" the teen scolded as she stood up, hands on her hips,
"Don't you wander off like that again! I thought we were searching for the rest of the Dragon Balls, not... that!" she exclaimed, pointing to the fish Goku was probably going to call lunch.
Within her, you could hear her talking, but took notice of something else: the pressure loosened the moment Bulma stood up, giving you some leverage.
Immediately, you begin to squirm, the damp muscles rubbing off against your face, coating it in a layer of smelly slime.
You still couldn't move properly, and you had no idea where the anus currently was because of the darkness all around you, so you could only rely on squirming, trying to get Bulma's attention so that she could get you out of herself.
As for the giantess, she felt that sensation again and giggled; Goku, who was munching on his fish, pulled back to look at his genius friend.
"Hey Bulma, is everything alright? Why are you laughing?" he asked, before gaining a smile,
"Are you thinking about a joke?"
"No no, Goku..." she replied, still wondering what the sensation was.
She thought about checking, but Goku was around...