Requesting a gangbang with Kurokami Medaka (Medaka Box) while she's in her underwear while her assistant/childhood friend Zenkichi is forced to watch her. She's willing here and is not raped by the way.

You can omit this part if it's too bothersome but maybe you can depict her holding him down or stopping/strangling him since Medaka's a superhuman and she's far stronger than Zenkichi. It don't really have to be this specific, as any similar situation will do.

Context is that Medaka is the student council president and she's determined to fulfill any student's request, and she will stop any obstacles even if that is her childhood friend.