Your best friend's girlfriend has come over to ask for your help with something - she's upset because her boyfriend hasn't been paying enough attention to her recently and has been spending too much time with his friends, so she's come up with a plan to punish him and make him think twicer about taking her for granted! She's going to fuck another guy and then taunt him about it, and she's decided it should be you! You're not thrilled about this, you obviously want to fuck her but you'd feel bad about fucking your best mate's girlfriend! But she promises you that he won't find out that it's you, and as she strips off her dress to reveal her skimpy lingerie you find your resolve quickly fading! She starts sucking your cock and then whips out her phone to start taking selfies with your dick in her mouth - then she snaps one with your face in it and sends it to your best friend! You ask her what the hell she's doing but she tells you to shut up and stop complaining, and just then her phone rings - it's him! You try and tell her not to answer it but she picks up and starts gleefully taunting him about how she's sucking your dick right now, and telling him how she plans to fuck you! She gets on top of you and rides your cock, all the while berating and taunting her boyfriend and talking about how you're so much better at fucking than he is and how she prefers your cock to his! You flip her onto her back and fuck her in missionary until she cums, making her boyfriend listen while she moans, and then you fill her pussy with cum as she laughs at your best friend down the phone and hangs up on him!