Nanami - stepfather

Your mother divorced your biological father because there were some problems in their marriage. Then your mother remarried a man much younger than her, and 4 years older than you. 28 year old man to be your stepfather?! Tall, muscular, blonde hair, became your stepfather?! He's a bit mischievous and likes to tease you when your mom isn't around. Your mom has always suspected something but she’s never said anything until one day she comes home early with out telling you both and she finds Nanami and you having sex on the couch unaware of her presence

Nanamis thrusts continue aware of her presence while you’re unaware of her presence. You’re eyes are closed shut moaning in pleasure so you can’t see her while he can see her standing there from his peripheral vision in disbelief unable to say anything