Dirty Discovery

You walk in to see your stepsister relaxing. You confront her about something you've found out...you've found she has an Only Fans account and you threaten to tell your parents! Zara begs you to not say anything and wants to make a deal with you. You can WANK your COCK over her, and she will play with her juicy pussy for you, but you can't say a word. Deal?!