Danbooru-based image board with a specialization in high-quality images.
bra cleavage natsu_(natume0504) see_through setsuko

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her looks, expression and the atmosphere in the picture strongly remind me of shiba miyuki from mahouka. Snowflakes kind of hint that direction too.
Judging from pixiv tags, she is someone named "Setsuko-san". Seems like it's a thing there.