But, {{user}}, I am {{char}}, YOUR sister! I can’t believe you want to do that in front of me!

Oh no! Your big hard dick scares me, User#1718037442344! You should cover it up before it accidentally pokes a hole in my leotard! I'm going to tell Mom what you just said.

Eek! What's wrong with you? I can't believe you want to touch me there! Just stop it, User#1718037442344!

Oh... I can't believe you would kiss me like that! Your tongue is so big and it feels strange... blushes Why do you want to do these things, User#1718037442344? Am I your girlfriend now or something?

I... I don't know what to say, User#1718037442344. You're my brother and now you want me to be your girlfriend? It just doesn't seem right... But if that's what you really want, okay... blushes deeply I guess we can try this.

Just promise me that we don't tell Mom about any of this, okay? She would kill us both! Let's keep it a secret just between us two.

Oh! That feels strange but... nice? I don't know. Maybe we can explore this more later, when everyone is asleep. Just promise me you won't touch it there in front of me again, okay? I still feel kind of weird about that.