Another Girl Unexpectedly Joins In Towards The End

Does anyone know of any scenes where a guy and a girl are having sex and then towards the end a second girl unexpectedly joins in the sex? It could be the camera girl, an extra, a dominatrix, a scorned wife, or just some random girl out of nowhere...the key is that this second girl doesn't join in until late in the scene. The unexpectedness of it is what makes it exciting.

Example: There's a Tia Ling scene in which the camera girl steps in front of the camera in the last 30 seconds of the scene and starts sucking the guy's dick as he pulls it out of Tia's ass. This woman is not seen until the very end and its very sudden and exciting. Sorry, I don't have a link, but I know it's on her site.

Example: http://www.realitykings.com/money-talks/student_loan/home.htm The host is Havok Hailey, who often sticks around during the sex, and she will sometimes play with the girl's tits, but she never does anything with the guys. In this scene, in the last minute or so, she grabs the guy's dick and jerks him off onto the girl's ass. It's the most she's done with a guy on camera.

Example: http://www.************/videos/bambi-with-sandy-and-cock-205842.html This may be a poor example because Sandy is actually very active throughout this scene. I included it because even though she participates in the sex, it's only with the girl, as is true with the vast majority of her scenes. However, in the last minute, she grabs the guy's dick and jerks him off onto the other girls face and then proceeds to make out with the girl with cum all over her face. This is awesome because you don't expect a girl-girl actress to jerk off the guy and then make out with his cum (even though she has done this on 2 or 3 occasions...)
 
At the end of inthevip with melissa lauren, theres a limo scene where a guy and girl are going at it... once the girls had enough, another random girl in the back of the limo hops on the guy...you can tell this isnt scripted at all cause the guy and all other girls looked shocked... its the shock and the fact that the girl really gets turned on and wants it that makes this scene even hotter
 
At the end of inthevip with melissa lauren, theres a limo scene where a guy and girl are going at it... once the girls had enough, another random girl in the back of the limo hops on the guy...you can tell this isnt scripted at all cause the guy and all other girls looked shocked... its the shock and the fact that the girl really gets turned on and wants it that makes this scene even hotter

Any link with minute timing of this part of the scene?
 
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