Nothing

You don't feel any different after drinking the stuff and, after a few minutes of searching, you and Karen give up on finding rubbers and agree not to go all the way.

You take things back a step and you put your tee-shirt back on. Karen puts her top back on but remains braless. You both sit up, side by side, with your legs on the bed and your backs against the headboard. There is a stereo with a remote and soon you have soft rock ballads quietly serenading Karen and getting her into a proper mood.

As the music takes its effect, you are soon heavily making out and groping the other under their clothes. You and Karen are getting really heated up when there is a loud knock on the door.