You annoyed your sister to the point where she revealed a family secret to you by accident...you are adopted! Oops! and now you are threatening to tell mom and dad unless she has sex with you! She does and is very grossed out! She wants to get it over, quickly stripping down, and riding you. She complains too much and you tell her to shut up. Then rides you crazy fast to make you cum! She is not happy that you came in her. You tell her that she has to do this forever or else you will tell your parents. *pov sex without dildo and implied cumming