"Tainted Tits"

Your girlfriend's best friend has invited you into her bedroom for a secret meeting about organizing a surprise birthday party for your girlfriend. But while she's brainstorming ideas, all you can focus on are the nipples poking out of her lacey top. She spots the bulge in your pants and realizes you've got turned on by her naughty nipples. Kitty knows you're not going to listen until you get rid of your boner, so she tells you to get it out and start wanking, but only if you don't tell her best friend!