MC feels pretty useless - after all, when both your parents were doctors who saved lives and families on the regular, it was hard not to compare your self to them. But when you touch your sick sibling, they feel better. This was your chance! You get to help others, and you finally feel better. But underneath the sweet surface of this new power, something is bubbling...

(Or: an insecure MC gets healing powers that are slowly eating away at their health.)