Is it permissible to move the body and legs to automatically move the penis with the intention of alleviating lust and abstaining from sin, when speaking with one's wife about matters that arouse lust?

What the questioner mentioned does not fall outside the meaning of blameworthy masturbation. Masturbation occurs by inducing the emission of semen while awake, even without using the hand, a cloth, or friction. It can even happen through mere looking or thinking. Its ruling differs from the ruling of emission (inzal) resulting merely from talking to one's wife on the phone.