>It feels like my entire spine is a sexual organ

There's a ritual based around the spine. 1. Do a light invocation, say a short verse and begin to think of succubus e.g"I want succubus... etc." 2 Limber up with a few easy stretches, arms, legs, neck 3. Do some dancing, listen to some energetic music 4. do some deeper stretches, spine, shoulders, hips 5. do another invocation, more detailed request, repeat it 6. meditate, relax your body 7. lay down, do a deeper relaxation, go into trance 8. repeat the invocation a third time 9. begin to focus on your energy as it courses through your body with the breath, and as it passes through you feel the spine and focus on sexual energy to stimulate the sexual senses.

short-term symptoms may include enhanced visualization of spirit, feeling of being touched, arousal, laughter; in deeper trance closed eye visuals and hearing voices. Also, during the sexual breath work, spine arching, neck arching, light trembling. As it continues you'll have sensation of having orgasm that can last as long as you can endure (minus the movement of sexual fluids, except in rare case i.e. nocturnal emissions state of function).
mid-term effects are mood boost, better sleep, more energy
long-term effects, if your mind allows, are more sexual/romantic confidence, more sensual, more creativity, good dreams, and of course the very "contact with succubus."

Remember, this is very much regulated by mind and beliefs, and involves letting your impulses take over in some ways