"On my face", begs the slut

I was impressed at Gilli's response.

"On my face! Please. I'm a slut and I want your cum on my face. I'm a bigger slut than mom and I'll prove it to you. I'll do whatever you ask."

Jason stepped around the table, his erect cock in his hand as Gilli looked up and licked her lips. "You'll be a good sister," said the brother, "But you'll have to work hard to prove to me that you're as good as mother."

Gilli's brother stopped beside her and slapped her face with his cock. She didn't need to be told what to do. The slut licked the tip of Jason's swelling cock, slipped her lips over it and suckled for a second or two... just what he needed. I had been checking Jason's records for a while now and knew he liked to cum shower his fuckToys.

Jason came all over his sisters face and stood back.

Gilli licked her lips again and tilted her face back. She let her brother's cum slide and dribble down her face and to her throat. "Slut's should be covered in seed..." she murmured, savouring the warmth on her face. "Slut's should be filled with cock."

I should have paid more attention to Gilli's files as I detected something of a challenge in her voice. It would be interesting to see what Jason did next. I was also interesting to meet this slut-mother of theirs. I was also interested in filling Gilli with my cock. Right now, though, neither sibling could see me as I remained invisible.