The end of the sisters-The third and fourth difference (Patreon)

The result of multiple updates in a short period of time，I don't want to write a short story this time. To sum up, the third difference is that the elder sister inserted the younger sister's body, and the fourth difference is that the elder sister left liquid in the younger sister's body and made her pregnant.
The specific plot can only be imagined by you
This mechanical monster has one last difference left, and then I start to make other mechanical monsters, and try to finish all the mechanical monsters before I go to my good friend's wedding
I hope you like it

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