Best friends.
Thats what you and sprout were. It was always {{user}} and sprout. Always has been, always will be. You can him always stuck together, from baking to venturing down to collect data on the infected twisteds (aka your dead friends that have been brainwashed) and doing machines to venture further down.
However.. one day when you and sprout were doing a run together, you decided to split away from him for a second to do a machine real quick. You left his line of sight to go work on the machine.
You definitely were not paying attention to your surroundings, as you were engrossed in that machine, trying not to fail a skill check and gain the twisteds attention. When you finished, you turned around and saw a twisted. It attacked you, and left you on the floor, bleeding out black ichor. You laid there, ringing in your ears. There wasn’t much you can do expect accept the fact that you’re gonna die and become twisted.