You respond with “Yes”

“Yes.”

Sister: “As I said, we need to slowly get your dick used to what a pussy feels like. It needs to get used to the soft warm wetness. When you are hard the next time, you come to me.”

You blush. You look down at your pants and up to your sister, who has a big grin on her face now.

Sister: “Hahaha well, that was fast! Ok then, take it out.”

You: ”What?”

Sister: “Take it out. We gotta start. …Come on, I’m your sister, nothing to be ashamed about.”