Akame ga Kill! — Esdeath ~ Ushio (borderline: ecchi-hentai)

Akame ga Kill!

(images: Danbooru)

Esdeath

(images: Danbooru)

~ Ushio ~

(images: Danbooru)

Definitions

Tags and Definitions page

ball gag — A ball gag is usually made of rubber or silicone in the shape of a sphere with a strap passing through its diameter. The most common diameter is 1.75 inches (44 mm), but other sizes can be found. [...] A ball gag's purpose is more of humiliation rather than silence; the wearer can still be heard, but it renders their speech completely unintelligible, distorts their facial features, and, should the wearer attempt to talk, excessive drooling will result. [...] A wiffle gag is a simple ball gag that replaces the standard solid rubber ball with a light plastic ball similar to the one used for the game of floorball. It is generally safer because there is constant airflow.

BDSM — a compound initialism from B&D (bondage and discipline), D&S (dominance and submission), and S&M (sadomasochism or sadism and masochism)

borderline — The fuzzy area where ecchi meets hentai.

chikubi (乳首) — Japanese for "nipples". 

ecchi (エッチ) — Refers to softcore or playful sexuality, within the Western animanga world, in contradistinction to the word 'hentai' which connotes hardcore, perversion or fetishism. Works described as ecchi do not show sexual intercourse or genitalia. (source: Wikipedia)

gag — A gag is a device sometimes worn during sexual bondage and BDSM roleplay. Gags are usually associated with roleplays involving bondage, but that is not necessarily the case.

hentai (変態 or へんたい) — A catch-all term to describe a genre of anime and manga pornography. The Western viewers / readers of anime / manga adopts and uses the word 'hentai' which connotes hardcore, perversion or fetishism. (source: Wikipedia)

karada (体) — Rope dress or a rope body harness used in Japanese bondage and other BDSM activities. (source: Wikipedia)

kyonyuu (巨乳) — Japanese for "huge breasts".

mizugi (みずぎ) — a woman's swimsuit or bathing suit.

oppai (おっぱい) — Japanese for "breasts", used only when the breasts are visible, no clothing or towels or the like obstructing the view, though visible nipples are not necessary.

paipan (白板) — An individual lacking pubic hair, usually depicted as female. This does not necessarily mean that the individuals hair was removed, it can also mean prepubescent.

shibari (縛り) — a Japanese word that literally means "to tie" or "to bind". However, this is a somewhat hidebound definition and the word shibari is now increasingly being re-imported from the West to Japan, as the tying communities are very much interconnected. Most Japanese kinbakushi do not object to the term shibari, as it's common vernacular in the global community. (source: Wikipedia)

shinju (真珠) — Meaning pearl, shinju is a euphemism to refer to the binding of female breasts. It has been popularly claimed that "shinju" is an authentic Japanese term for a "bikini harness". However, no such tie called a "shinju" is found in historic or present kinbaku.