Fucked my stepister's BF after he just fucked her

I woke up and left the room and heard the sounds of active sex, I decided to look and could not tear myself away. I started masturbating and watching. but then he went to the shower and I decided to offer him my excited body. I promised that I would not say anything and I started sucking his dick with the taste of my step sister's pussy juice. it turned me on even more