2girls animal barefoot bed bird blush book bow brown_eyes brown_hair building choker clouds computer dress gloves jpeg_artifacts long_hair misaka_mikoto pajamas paper rainbow school_uniform shirai_kuroko short_hair sky sunset tagme_(artist) teddy_bear thighhighs to_aru_kagaku_no_railgun to_aru_majutsu_no_index

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I like how kuroko is the blushing one and mikoto is the smug one in this picture
Kuroko is often flushed when thinking pervy thoughts in Mikoto's presence.

In this case she is flushed from having to wear a humiliating costume. Possibly it is a punishment for one of her frequent transgressions.
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