Brother-in-law had fun with sister-in-law

There was no one in the house, sister-in-law was cleaning the house, brother-in-law comes from behind and hugs sister-in-law, sister-in-law asks brother-in-law, why are you doing this, on this, brother-in-law says brother-in-law has asked me to take care of you, so I am taking care of you and slowly brother-in-law starts seducing sister-in-law.