As a slave I am only allowed to ejaculate with my Master's permission, or if He chooses to milk me, usually by digital prostate manipulation. That being said, yes I have ejaculated during crucifixion and, depending on how long I remained on the cross, sometimes more than once. Since I am trained to cum without being masturbated, the cornu is substituted for my Master's finger or penis and I will eventually reach orgasm and climax through my own feverish exertions grinding up and down on the phallus/dildo.