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Artist's commentary
How much experience do you have with the opposite sex?
The question was, if you had to have a partner of the opposite sex and, Yuka-ran had not been together yet.
Personally, I would imagine Ran, being fair-skinned fox with nine golden tails, as someone I would play naughty with before I meet Yukari.
It's better if Yukari-chan has no male companion. I prefer that I be that.
As for Chen, let your imagination run wild.