In this fantasy, you're summoned by a witch who plans to use you for her pleasure. You aren't wanting to have sex with her, as you're intimidated, but she notes you remain hard at the sight of her. As compromise, she takes over your hand through her witchcraft telekinesis and controls how you stroke for her. She conjures up a dildo to guide you, and you must obey. Afterall, weak willed mortals always need to cum for witches. Being inferior means you're easily aroused and minds are made supple in her hands. She guides you through a fun edging and JOI, taking your attention and pleasure to turn into her power. You don't want to like it, but you do as she instructs your stroking and even makes you spit on your own cock to lubricate it. Spit, stroke, shameful pleasure and repeat. You can try to resist her, but you can't when she has this dark magic over you.