Then again, I don't have a sister, in my fantasy story, Saber is my sister, so I won't be able to put that in my story for joke, but I'm sure one of my creepy character will have this joke played on him xD
Shine, do you have the updated version with the Tokuten? It has already been shared in this site, but all the other links seems to be unavailable. 恋妹SWEET☆DAYS