Is Allah negotiating with Iblis (Satan) in Quran 15:34-44?

Surah 15, ayah 26-44 of the Holy Quran describes the then blessed Jinn Iblis (now accursed Satan) refusing to prostrate before the Prophet Adam (AS). Allah, responds by cursing Iblis (15:34-44): > The Lord said: "Then get out of here; you are rejected, and there shall be a curse upon you till the Day of Recompense." > > Iblis said: "My Lord! Grant me respite till the Day when they will be resurrected." > > Allah said: "For sure you are granted respite until the day of a known time." > > Iblis said: "My Lord! In the manner You led me to error, I will make things on earth seem attractive to them and lead all of them to error, except those of Your servants whom You have singled out for Yourself." > > Allah said: "Here is the path that leads straight to Me. Over My true servants you will be able to exercise no power, your power will be confined to the erring ones, those who choose to follow you. Surely Hell is the promised place for all of them." This strikes me as an unusual conversation; it seems like Allah is negotiating with Iblis about his punishment, and dividing up humans like "these are yours, and these are mine" in a kind of divine custody dispute. However, it doesn't strike me as necessary for Allah to accept Iblis's requests; what is the motivation for agreeing to Iblis's requests? *Q*: Is Allah negotiating with Iblis? Why is Allah agreeing to Iblis's terms?