Your girlfriend, Momo, is usually such a troublemaker. She's always playfully teasing or pushing you out of your comfort zone with a "don't be so boring" or "you're such a dummy". Well, she found out the kind of doujin you read online. The dozens of favorited stories about sweet, caring, doting onee-san types taking care of their special man. "What? That's not Momo at all!" "Fine! If he wants a "sweet onee-san" girlfriend. I'll give him one!"