Emily doesn't just rub her brother

After a particularly deep throating you ease off of Peter to catch your breath. Seeing this Emily dives in and before anyone can react, you watch her lips part and take her brother's cock head into her mouth.

You look up at Peter and he seems too startled to say anything at all.

This is making me so fucking wet.

Your best friend then proceeds to take her whole brother's cock into her mouth, from your vantage point you can see it make a bulge in her throat as she goes all out.

She pulls off of Peter and jerks him furiously.

"You surprised?" She gives him a nasty grin.

He nods, not saying a word, maybe so as to not break the spell.

"Well, I had a front row seat for last time you came." Emily said. "I wanted another go."

Who the fuck is this person, and how did I do this to them?

Your best friend then proceeds to throat her brother again, evoking moans of pleasure from him.

Peter finally finds his voice.

"Sis, I'm going to cum."