i'm thinking about... pneumatic and hydraulic systems we use in our everyday lives. or, at least, trying to think of some. i got nothing at the moment
re:// lewd but technically true
@Felthry tragically, no dicks here
@pearshapes also a car's suspension, or a bus's air brakes
an automatic transmission is also basically an entire hydraulic computer, especially older ones
drinking through a straw probably counts as a combined hydraulic/pneumatic system
some types of car jack are hydraulic or pneumatic
lewd but technically true
@pearshapes your dick(s), if you have any