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Artist's commentary
Satori: Bathing together like this is great, huh
Koishi: How long has it been since we did this-? It seems like we've never done so in forever--
Satori: Well, isn't it...embarrassing?
Koishi: We're sisters so it's weird not to-! But I'm happy, reaally happy!
Satori: Really? That's good to know. It's also been a long time for me so I'm also having fun.
Koishi: Ehehe/// Also for Koishi to have Onee-chan wash her back for her is...Hyau, ticklish.
Satori: My, I'm sorry if it tickles.
Koishi: No, it's alright-! Awahawah- It feels great-!