Ethical Planar Binding

With this spell, you attempt to bind a celestial, an elemental, a fey, or a fiend to the Prime Material Plane for the Duration. The creature must be within range for the entire casting of the spell. At the completion of the casting, the target must make a Charisma saving throw. On a failed save, the creature is persuaded to stay on this plane for the duration. If the creature was summoned or created by another spell, that spell's duration is extended to match the duration of this spell.

A bound creature is friendly to you and follows your instructions to the best of its ability. You might command the creature to accompany you on an adventure, to guard a location, or to deliver a message. The creature obeys the letter of your instructions. If the creature carries out your instructions completely before the spell ends, it travels to you to report this fact if you are on the same plane of existence. If you are on a different plane of existence, it returns to the place where you bound it and remains there until the spell ends.

Ethical Caveat: The binding is a mutual agreement.  Should the celestial, elemental. fey, or fiend feel that its binder is acting contrary to its original alignment, or forcing the creature to act in ways that it would not normally wish to do, the summoned creature may make a new CHA save with advantage to immediately teleport back to its own plane of existence.  It may do this every round and will not take other actions beyond this save and protecting itself.

At Higher Levels. When you cast this spell using a spell slot of a higher level, the duration increases to 10 days with a 6th-level slot, to 30 days with a 7th- level slot, to 180 days with an 8th-level slot, and to a year and a day with a 9th-level spell slot.