「Grain in flames」makes little sense, but perhaps refers to the season of burning grain fields and stalks after the harvest, ostensibly to reduce insect populations and add ash to the soil, a good fertilizer.「Gonorrhea burning, flaming」in the LATE STAGE seems to reference the English AUTUMN that is conjectured to derive from the Latin meaning 'to dry up' and refers to climate, foliage, and human beings…in females, late-stage gonorrhea will likely cause infertility due to internal scarring of the fallopian tubes, and in males, the urethra may become virtually closed due to the same sort of internal scarring, 'to dry up' as the STAGE OF DECLINE, NEARING THE END.
Late in the year (or late in one's life), the time when leaves continuously drop from woods like falling drops of rain until the wood appears lifeless (the FALL):「burning flaming sensation with gonorrhea」constantly dripping gleet (the FALL) and as the season approaching death, the cold of winter when everyone will turn their back away from a dead diseased corpse (the really big FALL, 乘 as the ride into heaven, becoming a part of history past). See 季 as the「gradual progression of seasons.」
Older version of this glyph uses the「turtle」element (穐), understanding that the「burning, flaming」element actually is a combination of the elements「erection pursuing sitting copulation mate」(the FALL) and that one's「turtle, turtle head」is a Chinese euphemism for the glans penis wrapped in a wrinkly foreskin, may explain the glyph's now obscured and cryptic meaning as the time of year sages noticed when turtles produce predominantly male offspring, the AUTUMN [ https://www.sciencedaily.com/releases/2018/05/180510203722.htm 2018-05-15 ]
Or, simply describes the「danger from gonorrhea while plugging many orifices with bent penis」as the elements individually depict, the constant FALL of sticky drops. Oldest form (龝) adds「multiple bougie reamings」and「evil, enclosed by weave, net poultice.」
「Repeatedly bobbing head of woody with flaming person emissions」: a SWING that is actually a bit more than a piece of child's playground equipment: a type of leather harness suspended from above that held a person by the legs behind each knee in a position where not much movement was possible. With the knees up by the armpits and torso lowered into this SWING, the groin was naturally pulled wide open and could not be closed by the occupant. Very little effort was needed to move laterally for long periods as a male(s) penetrated various wide-open orifices from the front and rear, or a bevy of service providers plied their skills upon an immobile patron. See 'leather with emphasis on open crotch' (靫) that means 'to quiver' that suggests there may have been a waiting line of willing occupants wanting to climb into the swing for a long ride. Successive clients may well have caused brown or other colorful droppings periodically that resemble falling leaves.

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: a swing; autumn; fall; harvest time
Japanese EDRDG: autumn
Unihan extended: autumn, fall; year

Used within names (nanori)
あい