Robin and Starfire - The War Beyond Tamaran

Robin had fought great villains in his young age and no fear had ever torn him so viciously than the thought of Starfire leaving the Titans. After years of fighting crime together, his greatest fear had come true.
When a group of three Tamaranian teenage boys came to take her home, she had given them nothing more than a 'Yes' and would soon go after she knew the king she chose to replace her had died in a sudden attack.
Soon, Robin and the Titans find themselves finding their way to settle a war on a planet divided into two kingdoms. Bloody battles, betrayal, and a long line of heartbreaking history, Starfire found that this battle was hers alone to fight; While Robin and Vega would cross any line for her, Raven feeling the sensation of love for the first time, Beastboy in jealousy, and Cyborg with tempting promises; the team fought their greatest battle yet.

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I don't know the artist behind this Robin and Starfire background but all the credit to who made it!