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Koyori's idol knees are erotic from any angle or position, as expected as it is the nature of knees, but viewing them upright and from the front shows off their best qualities.
You can easily see the shape of the patella and the lines that trace her joints are exceedingly sexy. I think the sight of them is very dangerous to men.
Thank you Koyo for blessing us with your knees. Their eroticism is enough to melt the sun.