Jeff decides that between the lower puffiness, and not having the diaper press against him, that he doesn't like it within Megan's; Diana's vagina is way better. So, he manages to spread her lips apart and escape, luckily not getting peed on while in there or waking Megan.
Although this happens to be short-lived; While he's landing on the diaper again, Megan pees directly on him, soaking him. (Ewww...)
To make things worse, Diana attempts to pick Megan up to bring her to her room, causing Jeff to fall back, directly as Megan lets out a pile of poop. So here he is, stuck under a pile of poo while a pool of his sister's pee is below him. Jeff then carefully slides the poo off him, attempting to not make it any worse; (Maybe inside the vagina was a better idea...)
At this time, Diana sets Megan down on her bed, the sudden movement causing Jeff to be flung back into the pile. Jeff then thinks of an idea; (I could probably trigger her to pee again to clean the poo off me... Yeah, that'd be a good idea.)
So, Jeff climbs up onto her vagina again, sticking his finger in and messing with it until she wets herself; Successfully washing him off. Jeff then hops down, sitting against her crotch thinking...