You are staying with your step-Aunt and walk into the livingroom and catch her masturbating. I (your step-Aunt) am surprised, and then see that you're turned on too. I tell you (my step-Nephew) to take your cock out and jerk it for me while I masturbate. I instruct you how to stroke and encourage you to keep going while I touch myself. I count you down in the end so we can cum together...