「Asian EGGPLANT with a long, narrow shape is much smaller and thinner than Italian eggplant, and indeed resembles an erect human penis in some ways, an「emerging shaft with orifice efforts.」「Emerging shaft and augmented mouth force」suggests some real hard sucking for a long duration using a tag-team style, and the glyph means DEEP PURPLE (the color of a 'hickey, hickie, lovebite' resulting on skin after hard sucking), the color AUBERGINE being a natural result of powerful mouths augmenting one another in succession, a sort of round-robin tourney as it were.
DEEP PURPLE is also the color of shiny EGGPLANT skin (appearing to be wet)…other reasons for「power, force」and「orifice, mouth」(or combined as one element,「added, increase, join in doing, augment」) to mean EGGPLANT may be obscure. Eggplants being in the Nightshade family are related to tomatoes, potatoes, and tobacco:
「The eggplant has been celebrated as an aphrodisiac and feared as the cause of insanity…. The fruit was considered dangerous because it belonged to the nightshade family which contains many poisonous plants including jimson weed, angel's trumpet, belladonna and deadly nightshade.」
[ https://www.ngb.org/year_of/index.cfm 2012-07-25 ]
Seeds of eggplants contain a small amount of nicotine, and nicotine causes a release of dopamine in the human brain and also inhibits the reuptake or molecular breakdown of dopamine, norepinephrine, and serotonin (all three being「happy」chemicals, hence the addictive quality of nicotine) that may possibly be why we want to keep「adding this plant」(addiction) to our daily diet. Note that the lower elements alone depict the additional erectile ability of a human male after the addition of a new female (the erectile ability being due to a fresh release of dopamine upon sighting or recognition of the new orifices), and so the facts that eggplants release dopamine, albeit in small amounts, and the power of added orifices do the same, the EGGPLANT was obviously known to cause an effect similar to that of an added female to a session of sexual intercourse (known as the「Coolidge Effect」). It has been suggested that the sages themselves used tinctures prepared from massive amounts of ground eggplant seeds, both as an aphrodisiac and to experience the dopamine rushes (what Europeans believed to be 'temporary insanity' if you can imagine such a condition).
「Additional ability to continue sexual intercourse by male emerging shafts」after the addition of another female, known as the Coolidge Effect:
「Males of most mammalian species show a strong desire towards variety in sexual partners. In the laboratory, this phenomenon has been referred to as the 'Coolidge effect.' It was first observed among rats. The same effect is even more striking in farm animals such as sheep and cattle. Studies based on self-reports among human subjects found that partner variety is of greater interest to male adolescents, male college students and male adults….」
[ for a full discussion, including the effects of dopamine on the brain, see the European Journal of Human Genetics: https://www.nature.com/articles/5201763 2023-05-19 ]
「Emerging shafts with no-longer-integrated foot orifice and erection within」that resembled PURPLE EGGLANTS: as depicted in erotic Chinese art, men in dynastic China masturbated by wrapping no-longer-integrated feet around an erect penis ostensibly to lower the risk of contracting a sexually transmissible disease or infection that often occurred when performing coitus within some sort of mucous membrane system of a female service provider, and, to gain hand-control over the pressure applied to the foot meat surrounding a weakened penis that functioned as a living cockring.」
「Bound feet were once considered intensely erotic in Chinese culture. …The process was started before the arch of the foot had a chance to develop fully, usually between the ages of 2 and 5. …Qing Dynasty sex manuals listed 48 different ways of playing with women's [no-longer-integrated] bound feet」(after removing the binding cloths, of course)
[ https://en.wikipedia.org/wiki/Foot_binding 2012-12-17 ]

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: eggplant; phonetic character used in loanwords for the sound "jia", although 夹 is more common
Japanese EDRDG: eggplant
Unihan extended: eggplant