"What like it's a date?" Tony mutters to himself, once he's sure Clark's gone, though despite his sarcasm he isn't actually sure how he feels about that possibility. He shakes his head to clear the thought, it's a stupid one and he doesn't have time to waste brainpower on it, he's got jet fuel to make.

He makes the required trip to the chemistry lab, sneaking in to an empty one and mixing up the fuel as quickly and quietly as he can, it takes him maybe half an hour to make up the recipe he's been planning and another ten minutes to clear up after himself and hide the bottles in his backpack before heading down to the front of the school to meet Clark.