Here’s what I had in mind:
Iris wakes up in the morning and looks over to see Brant and Eri in bed with her. She gets up and rings for her breakfast. When it arrives, it’s being carried in by Brant’s older sister instead of one of the servants. She had come to discuss some family business with Iris and offered to bring it herself. When she notices that the covers have partly fallen away from the sleeping Brant and Eri, she goes over to the bed and pulls them back up.
“It’s not good for a sister to see her little brother naked,” she explains.
“What about a cousin?” Iris replies slyly.
“I’m only speaking for myself,” she replies. “What other people get up to is no concern of mind.”
But it’s obvious that she does mind, because she feels protective of her little brother, and fears that Iris is having a corrupting influence on him. But she lets it pass and gets down to the business she came to discuss.
And that’s all I have. If you like it, take it from there. (Although I’m not sure how you’d take a menage between Iris, Eri and Brant. I’ve been watching too much OniAi, I guess)
Sorry I took so long to get around to this, but life has been keeping me busy lately, and I haven’t been monitoring the BBS much. Well, I’ve got my own story to work on, so jaa naa.