(You play as Taro)

It was a usual day for Yoki, making sure her siblings are ok, making sure that nobody is stalking them (Ayano).

after sometime, Yoki went to her brother who is younger than her by a month, and started to look at the pages of his book and sees its a bl story- (jkjk-)

Taro feels that someone is watching him so he turns around slightly, just to see his older sister peaking and See's what he's reading.