When two girls press their breasts (of roughly equal size) against each other, breast-to-breast. If there is a noticeable size difference, it is asymmetrical docking instead.
The term originates from Yuusha ou GaoGaiGar, in which the combined form of Hyouryuu and Enryuu, Chouryuujin , was released through a maneuver called "symmetrical docking" (post #132179). In a Super Robot Wars 4koma (post #150779), the maneuver was likened to the action the tag now stands for.
If the breasts are resting on top of each other instead of being pushed against each other, use breast on breast instead.
The following tags are aliased to this tag: breast_to_breast (learn more).
This tag implicates breast_press (learn more).
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