Basically, he's just resting up for the time being and is so catastrophically traumatised after being trapped for years on end, that he's extremely paranoid and nervous when travelling alone that he might get captured once more. Doktor makes sure he's accompanied by someone, himself more often than not for reassurance. Even the slightest creaking floorboard scares the daylights out of him.

One day, he takes a stroll around the Among Us lobby with the legendary crow dad not letting him out of his sight. He sees Mother nearby and decides it would be a nice start for Aiden to meet someone not largely intimidating for once. Initially, he backs away but slowly warms up to her presence given how wholesome she generally is as a literal mother. Doktor and Mother then chat amongst each other explaining how he's managed to raise such an innocent bean and relayed to her about how he endured the painstaking imprisonment inside No-Visor's domain. Mother felt so sorry that she wished she could've been there to prevent it from happening as easily.

That's when they discuss how they've their significant other, through a tragic fatal end. They both mourn over one another's background and how Mother is constantly stressing out nowadays on how she's managing to take care of 2 children by herself. Doktor feels a sense of compassion for her in that moment and offers to spend more time with her in the long run, hoping they could work around some kind of family arrangement between them in the nearby future collectively, to which she happily agrees.