A Broken Heart

The Thieves' Guild tech Senth is about to claim will make him invisible.
Finally, the young halfbreed thief will be out of sight, shielded from the taunts humans fire at him. But when that tech reveals he has a human half-brother who's bound by a cruel slaver, Senth must find a way to save his brother from abuse and win him his freedom -- even though Senth is a slave himself. After all, this is what he's always wanted. A family.
There's just one problem.
That brother holds him responsible for every bad thing that ever happened, and he can't wait to make Senth pay.
Senth might be invisible, but he can't hide from the truth...

A sci-fi with found family set in the Thieves' Guild Academy.
Previously published as Bro (Antonello Brothers series).