"Step Mum Wank"

You need a lift but your dad isn't about to drive you, so you go and ask your step mum instead. She's busy working on her phone and can't take you, but you get distracted looking down the side of her blouse where you can see she's not wearing a bra and you can see her erect nipple. Your cock begins to grow and it doesn't take long for your step mum to see you have a hard-on in your pants!