/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