Well all you have to do is (presumably) grow a couple hundred times your size, which is a reasonable goal. From there you just have to eat anyone smaller than you. Seems easy enough. Good luck. Let me know if I can be of help.
Lucky for me, I'm sure I have at least a few thousand years to learn how to become a giantess 
. I think it's most feasible to wait until I go to Hell to become a succubus before I try that.
. I think it's most feasible to wait until I go to Hell to become a succubus before I try that.You have plenty of time to figure it out and go on a long reign of terror. You don't have to wait till you end up in Hell. The world is your oyster and everyone else are the fleshy parts that you scoop out and eat. Becoming a succubus in the afterlife is just a very neat bonus. The icing on the cake if you will. Or maybe you prefer the person on your sundae?
Sadly, I know enough about math and physics to know that becoming an evil giantess will have to wait until *after* I get access to magical power of the sort succubi have 
...so I guess the world would have at least a few more decades before I take over in the next life, as the succubus tyrant I long to be 
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...so I guess the world would have at least a few more decades before I take over in the next life, as the succubus tyrant I long to be .See that's why I prefer to be ignorant of math and sciences. So I can just sit here and pretend this radioactive barrel will give me superpowers. And well if that's the case I'm tempted to start living a life of sin so I can end up seeing your reign of underworld terror. Hope I can get front row seats.
"start living a life of sin"
Yes. Do so. It's a lot more fun. I should know, as part of my training to unleash my inner succubine goddess is living a life of general lust, gluttony, sloth, and "traditional" naughtiness that flies in the face of conservative Christian ethics 
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.What's it say about me that sloth stood out the most to me? It's all very tempting. I can't help but to feel like a fly staring at a pitcher plant though.