FINGERS (that in Asia include the thumb) are the「skillful」parts of「using hands」and the「reason for a hand to be, the fundamental purpose.」Nevertheless,「hand use」with「sitting person having tonguing mouth」or,「hand use to speak」with「service provider, concubine」describes a hand gesture, using one's hand for speaking non-verbally, to INDICATE, POINT OUT, POINT TO WITH ONE'S FINGER to which one was to be hired for short-term use by the client or visit the lord. Making a selection by IDENTIFYING one's choice. Note that in Japan, it is considered quite rude to point a finger at anyone today for any reason at all, perhaps because of this behavior in the past.
　Needless to point out perhaps is that humans often「taste with hands」by inserting, dipping in a FINGER or two and then applying that to one's tongue in mouth.
　「Skillful, clever hand use」is, naturally: FINGERING, TO FINGER, otherwise interpreted as「providing services with talented hands used to accomplish a task, sliding penis-like rod in orifice」(or, FINGERING as a reasonable facsimile of a penis), DIGITAL TALENT.
　「Skilled hands of tonguing mouth while providing services」might suggest DEPENDING ON the same sort of FINGER EXTENSION, EXTENDED FINGER(S) before dipping into herself or others bonobo-style, and DEPENDING ON the natural repeated application of saliva on fingers for starting and continuing the procedure (see 消. …just saying that's how it's done—don't like the glyph? blame the sages…). Something that most girls DEPEND ON for making HAIR STAND ON END (that means「genuine excitement」and not only pulling up one's hair strands). Used as a COUNTER FOR TRADITIONAL DANCING SONGS by the singing girls in China while dancing (without feet, remember) with「skilled tasty hands」: FINGERING.「Tasty cream on skilled hands with tonguing mouth」as licking the beaters, and so on.

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: finger; to point at or to; to indicate or refer to; to depend on; to count on; (of hair) to stand on end
Japanese: finger, toe, digit, between, face to face, hindrance, impediment, arrhythmic section of recitative in Noh music, prefix used for stress or emphasis, counter for traditional dance songs, ruler, measure, to point, to nominate, to select someone, to specify some person, to identify, to indicate, to point out, to play, to extend one's arm straight ahead, pointing at, to point at, thimble
Unihan extended: finger, toe; point, indicate
EDRDG: finger; point to; indicate; put into; play (chess); measure (ruler)

Used within names (nanori)
い　･　いぶ　･　さし　･　さす