Bond
The friendships amongst the Titans were not always as strong as they are now.
When they first formed, Raven, Robin, and even Cyborg were very distant and solitary, barely speaking to anyone outside of battle.
It was because of this that the two more social inhabitants of the Tower were pushed together.
They laughed.
They cried.
They comforted each other.
They told each other everything, from their most embarrassing moments to every excruciating detail of their tragic pasts.
They were the best of friends.
As the others opened up to them, they began to grow apart, becoming closer to their other friends.
But Beastboy was still the one to comfort Star in her candlelit room when the power was knocked out one stormy night.
And Starfire was the one who held Beastboy's hand when he received his long overdue tetanus shot.
A bond like theirs may weaken, but it can never be broken.