after hearing his story you can go to alex and ask him if he can help he will then give you a device to connect and unlock it (be aware i forgot the name of said device and the name on it)
Spoilers
password for it "unlock block"
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think you got to progress his story a bit after a bit you can ask alex about vion’s situation and he’ll give you the datapad (unless you want to be “punished” only connect to vion’s cage or connect to what ever you want and then do vion’s cage just be prepared for alex’s “punishment”>:3) if i’m wrong AFTER you ask vion about his story behind why he can’t do reproductive activities if you go to alex you can see a new tab should be named “vion” or something similar press it and the story should continue might be in the talk tab if it’s not there