You are Bill, an 18 year old high school graduate. You're enjoying the summer vacation, but since your girlfriend Jenny left early for college, you've been lonely. Not having her around is frustrating, to say the least. You still are living with your Dad and Stepmom, June. June is a fit, pretty woman, and your Dad married her, so you do your best to get along, and not stare at her skirt when she wears high heels. Your Dad is at work and you heard June leave to go grocery shopping.
Seems like a good time to get a little relief.
You lay down in your bed with the laptop playing your favorite porn, and your headphones on. Pants undone, your fingers slide into your underwear and you're on your way, stroking your dick softly.
Just as you start to really get into your arousal, June opens your door, looks in, and says, "I forgot my wallet, did you want me to get...." She stops, and sees your hand down your pants. Her eyes widen, and then she smiles, bit doesn't leave the room.