「Screwing within orifice and remain in, stay within」is a fairly reliable method of producing THE FRUITS OF ONE'S EFFORTS, i.e., siring a child.「Rod within tonguing mouth on wood」and「plugging orifice, mouth with woody」describing an EFFECT that may well produce FRUITS, RESULTS that FINISH a condition, SUCCEED IN ACCOMPLISHING the goal of obtaining a mouthful of fruits for one's efforts.
「Inside orifice, cavity」of「sheep, not yet ready, anything immature」all point to RESOLUTE DETERMINATION TO SUCCEED IN DOING one's desire in dynastic China, as these elements might refer to ovine zooerastia that was highly respected and praiseworthy, equated with deflowering an immature virgin as an experience long remembered by all involved, or even deflowering a ewe for that matter…「not yet in orifice」with「woody and muck hole screwing」obviously refers to desire for anal activity of some nature, whether with ewe, or not.
Some scholars suggest the top element is a morphed「cavity with two sets of lips」(臼) or「grasping with both the left and right hand」and a「woody」as in SUCCEED IN ACCOMPLISHING the goal, actions that USE UP the fruits and leave a RESOLUTE person EXHAUSTED. See the Used-In glyphs, such as 倮 meaning 'nude, naked, bare skinned' as it refers to genitalia.
As a「rice paddy tree」these elements might seem a bit strange, since most trees do not grow too well under water in muck-filled ponds, not to mention that farmers generally dislike trees growing within their rice paddies. The original rice paddies were built upon terraced slopes after removing all the nearby trees and stumps to allow maximum sunlight to reach the crops evenly and as much as possible.
The meaning of ENLIGHTENMENT perhaps has something to do with both the Chinese proclivity for engaging in oral and/or anal sex, and the English epithet (used only in the past and never spoken today of course) for male homosexuals by referring to them as FRUITS, particularly in light of these elements.

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: fruit; result; resolute; indeed; if really
Japanese EDRDG: fruit, reward, carry out, achieve, complete, end, finish, succeed
Unihan extended: fruit; result

Used within names (nanori)
み