Sorry, Sister, Your Friend Is so Sweet

Qiu Zhen has been very troubled recently. My sister's friend moved into my home. It was supposed to be a temporary stay until she found a suitable house. But things don't seem to be going quite right. "Brother Qiuzhen, what do you think of me?" "Well... It's pretty good." "Idiot brother, did you do something strange to Kotonoha?" "No! Absolutely not!"