timer, coco (pixiv artist 1131293), 1:1 aspect ratio, arms behind back, bdsm, bondage, both wrists binding 両手首縛り ryoute kubi shibari, bound arms, breast bondage, breasts, captured, chain, chastity belt, collar, confined, kinbaku, large breasts, nipple chain, nipple leash, nipple rings, nipples, nipple sign, nipple tag, non movement, nude, ound, pierced nipples, riding crop, shibari, spread legs, tears, tied