Trade with darkorangereturns
A sort of spin of this: https://www.deviantart.com/jedader/art/Beach-day-summer-2018-762320602
Etna, having a natural body heat higher than average people, have a little problem with the sea, touching the cold water she feels like a thousand knives stabbing her body, usually with little a little pool or lake, must wait some minute for warm up the water, but the sea it's too big for this, and shame herself for not enjoy a common swim.
Kurfust, seeing her a bit hesitant, decides to help her surpassing her "hydrophobia" showing her underwater exploration (or snorkeling)
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