Isn't it supposed to be the other way round? The first pic makes it seem like Alice is getting squashed and Marisa receives all her beanpaste, not the other way round.
But after that, Marisa's bean paste is transferred into Alice, either by another squash, which is not depicted, or Alice puffed herself to recover from the first squash and that she sucked all Marisa's contents.
Wouldn't it make more sense to just circulate paste between them both, then simply separate and reseal them again? I think the main reason the ko- has gone batshit is because it's got twice the amount of paste it should have (ie it's nuts because it's about to burst, not due to the hybrid status)
Good theory. It could be a little bit of both, but there's probably a better ratio of mixture if you put it all into one ko than if you slush it around before separating it back into 2 parts. You're never sure of the ratio and content of the mixtures that way, but this way it's always 50-50.