Horny Peruvian babe sees her brother in law masturbating and asks to be fucked

Disco night, so you're getting ready to go out with your sexy girlfriend to dance. As you're showering, your sister-in-law sneaks in and sees you naked. She gets horny because of what a nymphomaniac she is, and starts touching and masturbating on your bed. You come out and see her naked and horny. You know what to do, the party starts right in there, so why leave.