"Watch Me Instead"

You've gone to see your girlfriend at her house, but she's nowhere to be seen. Her sister is laying on the sofa flicking through the TV channels, but you notice her nipple hanging out of her top. Rose eventually clocks on to you checking out her sneaky nipple and can see the bulge in your pants. Don't worry, she won't tell her sister if you wanted to get it out and have a wank ?