Caster magically charm the target feels a profound admiration toward the caster, and feel compled to express it undying gratitude to the caster. 

Make a WIS saving throw.

On fail the target immediately used its reaction to move the most direct route to the caster, and sing praises about the caster. This movement will provoke opportunity attack. Until the beginning of the caster's next turn, the target cannot attack the caster or cause an negative area of effect involving the caster.

On success nothing will happens