Hey! I've been following this one loyally on Lezhin! It's pretty amusing. Guy, desperate for a job, starts working at an odd little cafe, where everything is good except the coffee lol. There are only 2 other workers there, who are longtime friends. The boss is deaf, so learning at least a bit of sign language is required. Then one day the main character hears the deaf bosses voice and gets turned on. Then he's simply on a mission to get over his helpless reaction to his boss' voice, but his boss finds out and gives him a "hand" ;)
Sign