It was an average day and chell was try a bunch of new test rooms for GLaDOS and was getting board of testing them and GLaDOS could see that so she sent Wheatley to have a sex party with her which she happily says yes too. After they've "got ready" chell starts by romantically kissing him on his eye which he replies "hey baby would you like to see my hard drive" at which chell "I`d like to do more than see it, believe me" at which point a metal rod extended out from just underneath his eye which he started to butt-fuck her with and inject thousands of ""nanobots" into her while she screamed with pleasure. Afterwards she started to blow him off while she stuffed a clone of him up her "portal", while this was happening rat man just happened to see the security camras and decided he wanted to join in so when he gets to the test chamber ratman rammed chell's head in his arse and all she did was eat his shit and licked his arse. While GLaDOS fills the room with testosterone so she can get a better porn show to watch.
The end