Ha, I’m not really sure if I can describe it, but first, learn to meditate daily so you’re used to entering that state of mind and learning to stay present, in order to focus your thoughts. This is very important!
Anyway, if you feel that intense sexual energy, lay down, eyes closed/eye mask, zero distraction (wear ear plugs or listen to calm music you like), and enter the meditative state. Let yourself feel that sexual energy, without a fight. Try to imagine what must be done to elicit that sensation, and imagine it’s your TF doing it with you.
Imagine in as much detail as you can how you’d respond (images are okay, but it’s your imagining your own sensations felt that come across the most, not imagining what his must be), and and send it back to him. Then wait to feel his response. I imagine a circle of energy in a clockwise motion, the energy moves from my twin through me (breathing in), then around back to my twin, through him, and around again (breathing out).
And the general vibe you must carry is one of surrender and peace. Switch your energy from “giving” to “receiving” (this was hard for me) and relax and wait for the energies to come.
I starting engaging slowly with his sexual energy for about a year Steadily gained strength, until it became undeniably real, even for my TF. Eventually, I learned enough to where I could relax and let his energy take over, making it feel REAL, and make it feel one constant orgasm that will not end 