My XX Deal with Big Sister Nero

All right, here's the problem: I've transmigrated. I have a beautiful older sister who's the emperor, second only to no one, and she's got a serious brother complex. What's more, she looks awfully familiar. How do I avoid getting my legs broken and being sent off to neighboring Germany? I've also met a very gen (phy)sically gentle older sister named Martha, and a purple old... wife and her giant black dog. How am I supposed to survive in this kind of situation? I'm seriously desperate here. Group number: 413992272

P.S. For reasons unknown, the group has been blocked. Searching for it by group number won't work, so I've put a QR code in the book's related section. Scan it to join.

P.P.S. From now on, I'll post bounty details in separate chapters in new volumes instead of putting them in the synopsis.