A bummer indeed, but, after the four of them have sex together, how can you continue the story?
If it leads there (and i hope it does) i hope that at least that final orgy is going to be long and good.
Maybe after Julie+Jack we will get a scene with Alex and Katie by themselves before having all of them together.
If Incog will actually be done with Chain Reaction after this chapter, i hope he'll go back to Double Trouble and make a sequel to that one involving Kim's mom as well.
Or maybe a final foursome for Emotion Sickness with Starfire, Robin, Raven and Beastboy together on the same bed, to give that comic a "proper" conclusion.