Benevolence

From your font of pure goodwill, as an action you conjure a ward of abjuration around a target, granting that creature a +2 bonus to AC for the duration. Subsequently each turn after you cast this spell, you may use your bonus action to change the target of this spell to a different creature within range. 

Whenever a creature who has this spell effect active on them is targeted with a healing spell, they can use their reaction to end this spell on themselves and use the maximum amount of healing that the triggering spell could heal. A creature targeted with this spell can use their reaction whenever they receive healing to maximize that healing as long as the healing spell is, or less than the level of this spell cast.