Ruby and Yang's first kiss really wasn't anything special. They wanted to practice kissing with eachother. Sure it might've been a little unorthodox for sisters to do, but they both trusted eachother and felt safe together.
It was more of a lip peck than anything else, gently brushing up against eachother. It felt... nice. Yang's lips were warm and inviting, while Ruby's were sweet and tasty. But they parted just as soon as they touched, neither getting to really enjoy the other.
Their second kiss though?
Ruby and Yang kept thinking back to that peck. They both wanted, needed, more. They tried to reassure themselves it was just curiosity, and besides, more practice couldn't hurt right?
Their attempts at rationalizing away what they felt fell apart when their lips met again, full of hunger and desire.
They tasted like home, like safety, like family.
Their third kiss was just as special.
And all the rest that followed