Formerly included elements of「glans with sucking mouth service providers」(崑), crystal clear as to what anyone's ELDER BROTHER was seeking, and the cause of any population explosion: breeding, reproduction. An opportunistic ELDER BROTHER with these elements likely as「tonguing mouths while concubine comparison shopping.」Nonetheless,「tongue in mouth」as speech, with a toothless tongue wagging while「sitting on buttocks most of the time」might better describe an old man's opinion of his DESCENDANTS, and the MULTITUDE, TANGLED MASS of bodies that is now humanity. Frankly, it is difficult to argue the sages were not implying that somebody's nameless elder brother copulating with a nameless service provider that resulted in conception and birth of yet another nameless teat-sucking meatball was not an uncommon occurrence in China with its ever-burgeoning population growth over the millennia, giving rise to generations of nameless meat forming a MULTITUDE, TANGLED MASS of bodies similar to SWARMING INSECT LARVAE that is now humanity. Commoners, or serfs, peasants did not have family names in the old days. It was purported that only the gentry could trace their lineage, and the remainder of us are simply bastards. Perhaps it is no coincidence that the glyphs for human children, maggots, spermatozoa, and rats (孑, 子) are strikingly similar and at times used interchangeably, all meaning「high rate of propagation, fast breeders」(the average human adult male produces 300,000,000 sperm per day).
「Tonguing mouth」as a voracious meat-sucking insect such as a mass of maggots, not unlike a「professional fellatrix in comparison shopping contest」hoping to be selected for purchase by a wealthy master as the elements suggest:「Viewing women as commodities [see 品] was also made customary from Song Dynasty (960 - 1279) forward, both in the suddenly expanded labor market and within relationships. Men could sell their female kin to slavery or prostitution, and frequently did.」
[ https://www.zum.de/whkmla/sp/0910/hersheys/hersheys5.html 2011-04-05 ]
「In traditional Chinese medicine, there has never been a mental disease called pedophilia (or an equivalent term), or homosexuality, or most of the other so-called sexual variations for that matter. …Children are usually described as natural sexual beings and erotic stimulation and sex-play are seen as beneficial to their healthy development.」
[ https://docx2.com/wp-content/uploads/Are-Any-of-the-Pharaphilias-in-DSM-Mental-Disorders_.pdf 2023-05-14 ]
And as for the two「sitting person」with「tonguing mouth」elements:「Bound feet were a mark of beauty…. Women, their families, and their husbands took great pride in tiny feet, with the ideal length, called the 'Golden Lotus,' being about 7 cm (2.75 inches) long. …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 bound feet.」
[ https://en.wikipedia.org/wiki/Foot_binding 2012-12-17 ]
Beetles form the largest group of living things, accounting for about 25% of all known animal life forms on the planet as counted by the number of species. The ants probably hold the top position for sheer combined animal body mass and in number of individuals (excluding prokaryotes and single-celled eukaryotes). Fly maggots and beetles normally colonize corpses and carcasses from the top and the ants from beneath, ingesting the putrid flesh in ever-thickening TANGLED MASS of bodies and SWARMS in layers by sucking up the juices formed as bacteria and larval secretions decompose the flesh. Likening the mass of tangled larvae and insects writhing together in an orgiastic curtain of teeming meat may have inspired the meaning of DESCENDANTS in China, similar to a venerable old man meeting with all his great-grandchildren rugrats.
It is no coincidence that the English root word「broth」meaning fluids in which meat has been heated, cooked and fired, is used to describe「someone who broths」as a brother and a「house for brothing」as a brothel.

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: variant of 崑; descendant; elder brother; a style of Chinese poetry
Japanese EDRDG: descendants, elder brother, insect
Unihan extended: elder brother; descendants