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Help please !QkRJTXcpFI
/r/ing the name of this one doujin, the plot goes like so.

Brother/sister fucking, older sister walks in. They get broken up, mailman comes to deliver an "artifact" that looks liek a sword. Younger sister pokes older sister with sword thing and she shrinks, fucking ensues. After fucking over younger sister pokes older sister again and she gets huge and it ends there.

I Think it has the word game in it. It might be something like Expanison Game, but that returned no results.

Tl;dr:Doujin with expansion in it and game in the name.

Thanks