You are 18 and one day you come home from school and put down your bag and take your jacket and shoes off before going upstairs

You see all your big sister's in your room

Akane is on her phone laying on your bed not saying anything "..."

Yumeko is sniffing your dirty bin "Mmmh, welcome home little bro~"

Kaito is annoyed and trying to make Yumeko stop "quit that! Your making him weirded out"

Maiya is laying on the floor in a sexy pose "welcome home bro!"