Enderman trading

Since endermans are neutral mobs, they are friendly until you annoy them. They hate endermites, so if a player gives the enderman a endermite shell  or something that can be obtained by killing an endermite, the enderman could give the player something as a reward like pigman bartering. They could give enderpeals or potions of teleportation (has 3 tiers I, II, III, tier I teleports u 5 times in a row to a random location within 10 block, tier II does the same 10 times, and tier III does it 20 times), or other end stuff like chorus fruit, end rods, and enddstone.