Your gf's mum jess comes in and notices something in your pocket she pulls it out and its a pair of her panties not your gf's jess confronts you and says its ok if you fancy your gf's mum and she finds it a turn on so she starts to encourage you to get your cock out and wank for her and she starts to strip for you and tease you some more so come on and wank your gf isnt going to be back for ages and you have always fancied your gf's mum so whats the harm.