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Book 4 in The Droplet series. You can start from here too (no need to read the books before).

Steve got kicked out of James' house. After saving the boy's life and made him mobile again he got to safe himself.
James got to time to think and grieve, Steve ends up at Sebastian (new character) a guy he met in the far far past. but things go terribly wrong!
how will this end?

The first 3 books can you find in my readinglist, they're made on an account I share with others.