Blue Balls after session

The weird thing is I masturbated first! Then I had a one hour Helix session. Then big time ache in my testicles, yet certainly don't feel like masturbating again. Any ideas as to why?

I'm sorry to say I don't have a good explanation for the phenomena you experienced. If you ejaculated to end your masturbation you probably entered your refractory period but by immediately following with an Anerosession you may have foreshortened your refractory period thereby reinstating the arousal phase of genital excitement. This might induce a condition similar to the effects of a ruined orgasm in that you remain excited (though unable to ejaculate/orgasm again) until the vasocongestion naturally abates. I doubt you have done yourself any injury, just remember to practice safety in all of your experimentation, go slowly and gently.
Good Vibes to You !

@rumel thank you very much. Makes sense!