I was starting to think this comic was losing steam, the issue "why hasn't this blond fallen out of love with this little freak yet?" was getting harder and harder to ignore, but then they reveal the onee-san's cuck kink and goddamn I'm fully back in lmao. Who cares about rationality, let the good times roll! I want this to keep escalating until it's not in any way recognizable as a modern setting with human characters. Maybe they can start exploring parallel universes find one where they weren't born sisters, or at least one where incest is legal. Maybe aliens invade and the older sister can cuck a Martian. Maybe the little sister and her amazing physical prowess can get recruited as a Valkyrie and fight the Honkai to protect all the beautiful sisters in the world. Nothing is too far for me lol.