Also known as: 乳首コンドーム, used_condom_tied_on_nipples, 系在乳头上的避孕套
Condoms, usually a Used Condom, tied around the circumference of a nipple (see Tied Nipples).
Otherwise, a condom whose opening is wrapped around a nipple/breast in such a way so that the condom can be filled with breast milk (see Lactation Into Condom).