R to L 1) M, mya-mya*... Reimyu*'s pon-pon[dunno what it is] hurts*...!
2) Yu"* yu"* Yuyu'! Little one, hold on[endure it] easy! Don't poo poo! *burp* You'll be unable to take it easy anymore! *urp* Reimyu*'s pon-pon hurts* toooo!
3) Top to bottom R, then L Mommy will li-ck li-ck for you! Let's hold on[endure it] easy okay! Take it easy! Yu"wuu" Yu"'... li-ck li-ck
4) R to L [all of these are slurred like through gritting teeth or holding breath] Yu", yu"gyuri" [yukkuri*, easy] ga, gawan... [endure, hold on] jyu, jyu.... [will, the first part]
5) Top to bottom, R to L Mo'"... Jyo" Yu"... dayo"... ....!!!! ----- [not sure what it's trying to say here. Maybe "I wanted to take it easy more" or "Just a little more"]
Considering that probably I will be wrong, I think that "ponpon" could be either the anyaru or the belly around the anyaru, even it could be the tube which connects the anyaru with the entrails (bean paste) of the Yukkuri.
My guess is they've been injected with more water, so their paste is really thin. So if they start leaking shit, then it won't stop coming out, being watery. They're extra fat and 'sweating', plus her shit looks watery.
They just shit extra bean paste right? so if it was watered down and mixed up, they'd shit their not-excess paste too, their magical internal organs, and then die.
I think any shitting yukkuri generally looks more fat than normal. Perhaps it's the perspective of leaning back, but that's how they look in other stories.