You spy on your sister in the shower and her room, recording her as she puts on makeup and masturbates. She agrees to show tits and suck dick if you delete the video. She pretends to be upset but you find out she liked it when you recorded her again! You come back again and she wants to give a tittyfuck, rub your dick against her pussy*, and you cum in her mouth (implied cumming).

*sister does not allow penetration but allows dick against pussy rubbing