天使の小窓 谷間ホール 乳间缝隙 纽扣缝隙
A small gap between the buttons of a button-up shirt, usually exposing a view of the character's cleavage. The gap may be caused by a popped button, a partially unbuttoned shirt, or by a taut shirt tenting out due to the character's bursting breasts.
The shirt should still be buttoned above and below the breasts, and the breasts should not be fully exposed.
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