Sisters that are like the poles of a magnet.
Little sister spending time with her big sister in her bedroom. She could hang out anywhere in the room but she chooses the bed, where her big sister is. Where it's safe.
Big sis sits cross-legged on top of the covers at one end and little sis lays at the other on her stomach kicking her feet. They both read their books. They don't interact or make eye contact, they just simply enjoy each other's company.
Wordlessly, magnetically, they drift closer over the afternoon. First a leg touching. Then the little sister curling up near her older sister's side. Then the little sister sliding in to press against her and feel her warmth. Then gentle, caressing hands on one another.
Eventually they find themselves cradled in one another's arms, still focused on their parallel reading but faces inches apart. Eventually their lips drift together and meet in a tender kiss.
Is this their first kiss or their hundredth? It doesn't matter, they're sisters. It doesn't matter when or where they are in their lives, they will always find their way together and fall in love. Always.