[Don't worry, the lightning affinity will still be yours. Just attain S rank and I'll permit you to integrate with it. There's no special reason as to why you should attain S rank before you can integrate with it. I just do what I feel sometimes. You know what I'm saying? That's all.]
Kailen was at a loss for words. "But you said… ah, never mind." He knew that arguing with the Time Dilation Artifact was pointless. He felt cheated, honestly; after all, the reward for completing the mission was the lightning affinity.
[Look, technically I've not cheated you. I only said the lightning affinity would be your reward. I never mentioned when you'll be allowed to integrate with the affinity. You are the one who assumed you'll have it right after completing the mission. Tsk.]
