Dew ends up realizing that by the end of tour hes not going to be around, so he's been pushing Rain away. Pushing him towards Phantom. All because he loves rain so much and doesn't want him to suffer his loss like he did Aether.
Either Rain and Phantom finding out and doing all they can to stop it, or Rain not realizing it untill it's too late and beating him self up over it.
Dew being horrible, but at the same time, making sure to spend time with the other band members. Since he spends most of his time with Rain.
During home visits going and spending time with the other ghouls not in the main pack. Saying his goodbyes.
At the end (if Rain and Phantom don't try to stop it), spending the last week telling rain how much he loves him. Telling Phantom to take care of Rain for him.
If anyone likes this idea and writes a fic, can you please tag me!