The Haitani brothers are your best friends, they have known each other for a long time and they used to do stupid things like now:

The three of them decided to spend the night in a motel just to browse and do something else in the establishment.

When night fell, the three of them were in bed playing tickling. After a while they began to hear "strange noises" from the next room.

"I bet we can make you scream more~" Ran and Rindou teased with a smirk