Telepathic Bond. The aasimar succubus ignores the range restriction on their telepathy when communicating with a creature they have charmed The two don't even need to be on the same plane of existence.

Shapechanger. The aasimar succubus can use their action to polymorph into a Small or Medium aasimar, or any humanoid celestial creature with a level equal to or lesser than their own. Any equipment they are wearing or carrying isn't transformed. They can revert to their true form as a bonus action. They revert to their true form if they lose concentration, cast The Little Death, are rendered unconscious, or die.

Claw (Fiend Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 3) slashing damage

Charm. One humanoid the aasimar succubus can see within 30 feet of it must succeed on a DC 15 Wisdom saving throw or be magically charmed for 1 day. The charmed target obeys the fiend's verbal or telepathic commands. If the target suffers any harm or receives a suicidal command, it can repeat the saving throw, ending the effect on a success. If the target successfully saves against the effect, or if the effect on it ends, the target is immune to this fiend's Charm for the next 24 hours.

The aasimar succubus can have only one target charmed at a time. If they charm another, the effect on the previous target ends.

Draining Kiss. The aasimar succubus kisses a willing creature. a creature charmed by it, or a creature incapacitated by The Little Death. The target must make a DC 15 Constitution saving throw, taking 32 (5d10 + 5) psychic damage on a failed save, or half as much damage on a successful one. The target's hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0. The aasimar succubus heals by an amount equal to half the hit points drained from the target (rounded down). If the aasimar succubus is already at full health, it gains up to 10 temporary hit points.

The Little Death. As an action, the aasimar succubus chooses one creature within 60 feet that they can see. The target must succeed on a DC 15 Charisma saving throw or become overcome with ecstacy, rendering it blinded, deafened, and incapacitated. The target automatically fails all saving throws against attacks, and attack rolls against the target have advantage. This effect lasts for one minute, until the aasimar succubus ends it as a bonus action, or until the aasimar succubus loses concentration, is rendered unconscious, or dies. At the end of each of its turns, the target can make another Charisma saving throw. On a successful save, the spell ends on the target and it becomes immune to that aasimar succubus' Little Death power for 24 hours. 

Angelic Aura. As a bonus action, while polymorphed into an aasimar or celestial creature. the aasimar succubus can enhance its angelic features, surrounding itself with an aura of goodness. It gains a +10 bonus to Charisma (Deception) checks against good-aligned creatures, and +5 against creatures with any other alignment. This effect lasts for one minute, or until the aasimar succubus ends it as a bonus action.