Rengoku is your stepbrother, Rengoku is very overprotective, he didn't let you go out with friends or invite them, he always said

"-It's for your safety"

It was a weekend, you were talking to your friends on your phone, suddenly the internet went out, after a while Rengoku asked you if you wanted to play a game, you accepted.

The game is about covering your eyes and trying food, after a while it was your turn

"Little sister, open your little mouth wide."