![1boy 1girl black_hair blur_censor bouncing_breasts breasts butterfly_hair_ornament censored dark_skin dark_skinned_male gradient_hair hair_ornament hetero highres kimetsu_no_yaiba kochou_shinobu medium_breasts multicolored_hair nipples nude open_mouth penis purple_eyes purple_hair pussy pussy_juice saliva saliva_trail sex shiny shiny_hair solo_focus vaginal waterring rating:e score:14 1boy 1girl black_hair blur_censor bouncing_breasts breasts butterfly_hair_ornament censored dark_skin dark_skinned_male gradient_hair hair_ornament hetero highres kimetsu_no_yaiba kochou_shinobu medium_breasts multicolored_hair nipples nude open_mouth penis purple_eyes purple_hair pussy pussy_juice saliva saliva_trail sex shiny shiny_hair solo_focus vaginal waterring](/cdn_image/preview/53/0f/530fcebceb2b9154b492576fdb57d0a2.jpg)
Refers to breasts in motion, often as part of a .gif or flash animation. If it is not an animation, something like a motion blur or movement lines must be present to convey a sense of movement.
If one breast is up and the other is down, add the unaligned breasts tag as well.
Example: post #694780.
This tag implicates breasts (learn more).