Show Sarah what you did at the party

You took care of Elena, making sure she was comfortable and had everything she wanted. Another reason you were glad you were not Elena's sub. She would be worse than you, with only little aftercare, but it would be more of a courtesy as she was your big sister. You were nicer, putting more into aftercare, as you do when you dominate Elena.

You took Sarah into your room where you hooked the phone up to your laptop, and crawled onto the bed and opened up the video you recorded. Sarah, still naked almost instantly, started rubbing her pussy "You recorded this?" she asked.

"Yeah, I had a feeling Elena would hate seeing she was recorded when she was being fucked, especially being dominated." you said.

"We could..." she moaned, leaning back "...use this as a punishment." that thought must've made her wetter as the sounds of her pussy filled the room. You were thinking of that too. You licked your fingers, then fingered yourself. Both of you were rubbing and fingering your pussies, masturbating next to each other while watching your sister's sex tape.