Some words to use when writing things:

• winking
• clenching
• pulsing
• fluttering
• contracting
• twitching
• sucking
• quivering
• pulsating
• throbbing
• beating
• thumping
• thudding
• pounding
• humming
• palpitate
• vibrate
• grinding
• crushing
• hammering
• lashing
• knocking
• driving
• thrusting
• pushing
• force
• injecting
• filling
• dilate
• stretching
• lingering
• expanding
• bouncing
• reaming
• elongate
• enlarge
• unfolding
• yielding
• sternly
• firmly
• tightly 
• harshly
• thoroughly
• consistently
• precision
• accuracy
• carefully
• demanding
• strictly
• restriction
• meticulously
• scrupulously
• rigorously
• rim
• edge
• lip
• circle
• band
• encircling
• enclosing
• surrounding
• piercing
• curl
• lock
• twist
• coil
• spiral
• whorl
• dip
• wet
• soak
• madly
• wildly
• noisily
• rowdily
• rambunctiously
• decadent
• degenerate
• immoral
• indulgent
• accept
• take
• invite
• nook
• indentation
• niche
• depression
• indent
• depress
• delay
• tossing
• writhing
• flailing
• squirming
• rolling
• wriggling
• wiggling
• thrashing
• struggling
• grappling
• striving
• straining