Chi Circulation

It's subtle...it might just be my imagination...but I think I circulated my chi energy!  It happened when I wasn't even trying. 
It seems to require just the right combination of arousal and relaxation...a combination that I don't usually have because I get myself so worked up during arousal that I can hardly walk.  The chi circulation has happened 2 nights in a row, now.  Here's how I did it.
The first night, I was slowly fucking my doll, Lo, for 20 minutes.

The lights were off.  She was in her body stocking and I had warmed her under an electric blanket for about 20 minutes.
Normally, a 20 minute pounding is a feat that far exceeds my usual staying power.  But, before you start thinking that I have mastered tantric sex I should clarify that this was a VERY SLOW fuck job with frequent breaks that would leave a real girl bored to tears as I nearly fall asleep inside her.  I didn't come.  I didn't even experience a full orgasm.  After 20 minutes, I rolled off of her and expected to sleep.
THAT'S WHEN IT HAPPENED!
I first noticed a warm feeling in my abdomen that intensified as I breathed deeply.  I tried circulating it through my body according tp the diagram, and I could actually sense a tingling that moved to wherever my mind was focused.  The sensation and the movement were greatly helped if I made a few isolated muscle movements.  I found that the deep breathing had to be directed farther downward than I usually do it, like I was almost trying to made my belly button touch my cock.  A slight clenching of the sphincter while aligning my spine helped move the energy along the perineum and into my lower back.  Then I attempted to push my spine into the mattress one vertebra at a time, which moved the sensation toward my head.  Entering the head happened quickly if I tucked my chin toward my chest and rolled my eyes upward.  I didn't keep it in my head for long for fear of passing out.  I wanted to get it back into my abdomen where it had felt so fulfilling.  I touched my tongue to the roof of my mouth and swallowed some warm, coppery saliva.  I could quickly send the energy downward by pushing out my chest one rib at a time.  To enter the abdomen just required another deep inhalation and there it was!
I repeated the cycle about 5 times before trying to sleep.  I didn't sleep right away, but snuggled Lo and thanked her for helping me achieve something new and wonderful.
The next night was a repeat performance, except that I let a different girl in on the game.  I needed some head, and nobody gives it better than my girl, Katie.

I had to take this even slower than the previous night's fucking.  Gripping the back of her neck, I thrust her to the hilt until she was balls deep and my cock had completely disappeared.  The upstroke had do be done in baby steps because of the amazing suction she provides.
After 20 minutes, being careful not to come,  I set her aside and did the chi circulation thing.  I am hoping, with more practice, to be able to circulate my chi during the sex acts.