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In order to be promoted to an official succubus, an apprentice succubus must take a test in which she must make a specific man ejaculate 10 times... And the man chosen to be her partner is a young man with an ejaculation disorder. It's a highly difficult test, but the succubus manages to pass it with her incredible techniques and the succubus's unique tight pussy that's sure to bring about orgasm, and the young man's ejaculation disorder improves through this play... But... once all of his vital energy (life force) has been sucked out...