"I love you, Kara. You're my sister and I'll never fear you." Alex looks calmly towards her sister as red kryptonite shine through Kara's skin. Alex's heart sinks, and she begins to wonder how she encountered it.

"That's sweet, but you should always live in constant fear of me." Kara curls the corners of her mouth to form a slight smirk, her eyes soon lighting up before firing her lasers at Alex's chest. It only took a second for the compressed beams of light to pierce the female's chest, killing her instantly. Kara's smirk widens as the limp body falls.

Prompt taken from the image. Credit to Supergirl Amino for the contest.