My Yandere Big Sister Adopted Me, So Why Are All the Fairies Panicking?

The first thing the proud, haughty fairy said after joining the harmonious family was to declare war on everyone.

"Big sister, wife, lover, cultivation partner, senior sister, junior sister, partner, accomplice, sworn enemy... even mother-in-law? I see. You're all so pitiful, getting terribly anxious unless you keep announcing your relationships with each other."

The good news: I transmigrated and got a nifty little tool, then my big sister picked me up, and I even met the proud, haughty fairy.

The bad news: things went catastrophically wrong from the start. I have to build the nifty little tool myself, my big sister is a yandere, and the proud, haughty fairy came to my house and chose the most chaotic way to play.

Later, my big sister crawled into my bed and interrogated me.

"I never asked you to preserve your pure yang body forever. I'm not a demon, after all. But what's with all these women? What happened to your sense of chastity? How old are you? Keep this up and you'll turn into an eight-tailed serpent. If you keep this up, I'm really going to have to give your butt a good spanking. I mean it."