Elements「advancing quickly with back and forth motions in a hairpin turn deeply bending with tonguing mouth」suggests autofellatio, perhaps? how about:「open tonguing mouth with open tonguing mouth again on woody shaft, big screwing in two hands」?
　「Autofellatio is the act of oral stimulation of one's own penis as a form of masturbation. It is physically possible for men who have sufficient flexibility, penis size or a combination of the two to perform autofellatio. …It has also been observed, simultaneously with manual masturbation, among Cape ground squirrels. Egyptologist David Lorton says that many ancient texts refer to autofellatio within the religion of Egypt, both in the realm of the gods and among the followers performing religious rituals」
　　[　https://en.wikipedia.org/wiki/Autofellatio 2013-08-05　]…and so on, with China not to be outdone. Right element also means「bent back on itself」as does a hairpin turn, and a man with a very dexterous and flexible spine.
　Without a doubt, the Irish also have knowledge of their own to pass along in these trying times:「Masturbation will not spread coronavirus, especially if you wash your hands (and any sex toys) with soap and water for at least 20 seconds before and after.」Nonetheless and regrettably, unlike in dynastic China, it must be undertaken alone to truly be a preventative countermeasure but still achieve the desired result with some degree of safety.
　 　[　https://www.sexualwellbeing.ie/sexual-health/sex-and-coronavirus/ 2020-03-31　]　
　The Dutch, too have the same solution—it seems masturbation has become mainstream in the media the world over due to the coronavirus (it has always been 'the main stream' in reality, albeit covertly for most folks):
　「'Don't have sex with your partner if they have been isolated because of (suspected) coronavirus infection,' the RVIM says. 'Sex with yourself or with others at a distance is possible (think of telling erotic stories, masturbating together).'」
　　[　https://www.theguardian.com/world/2020/may/15/dutch-official-advice-to-single-people-find-a-sex-buddy-for-lockdown-coronavirus 2020-05-16　]　
　Needless to point out perhaps, but Chinese shamans from antiquity hit upon the same solution as a pandemic preventative countermeasure, honed for ultimate client satisfaction by utilizing naked females with no-longer-integrated feet as masturbatory sex buddies available for short-term rental with erotic visualization of live prepubescent female genitalia engaging in autoerotic stimulation herself, as a solution to the same problem facing us now, but in pre-Internet days.

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Chinese: bright; brilliant
Unihan extended: bright, brilliant
EDRDG: bright; brilliant