:The Succubus Fantasies:

Your sister stops eating and looks sad. The weight she had put on beings to shrink off her. She's reducing before your eyes. The same thing is happening to you. You're getting thinner... and also weaker. You're becoming waif-like and wobbly, Thinner than before. Your sister falls down before you like a deflated blow-up doll. This is going badly wrong. You reach out to grab some food, but your arms are already too weak. This has rapidly turned to horror - a horrible nightmare.
You look around and see a witch in the corner of the room looking at you and shaking her head. It's the last sight you see before you too wither into nothingness.