Adam watched while they had sex and Germain was about to cum in her mouth. The drug would do the same thing no matter where it ended up. Giving the fact that it was going inside her mouth would gave her an oral fixation for the time being. The good news with that was that you wouldn’t have to swallow any of it the bad news would be that the drug will be on a constant repeat going from the mouth of Kara back to the dick of Germain. So in theory they could have oral sex for hours.