My useless rrat infested brain always assumed there was something more to it (especially after finding out that Walfie had interacted with Pomu's past-past life, and that Pomu made a serious attempt at the idol thing apparently around the same time that Kiara did)
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But I guess sometimes the simple explanation is good enough; Pomu just has good taste in waifus. (obviously biased because I like the orange woman too)