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Artist's commentary
"Did you think I wore panties? Fufufu! Idiot♥"
Riran discovered that boys will bend forward if you show them your panties.
She got the idea from mishearing, "panties are a boy's weak point!"
Afterwards, she showed off her swimsuit as if they were panties.
"Did you think I wore panties? Fufufu! Idiot♡"
After teasing them, the boy laughed and made fun of her, but that's another story...