Your Intelligence score increases by 1, and your Charisma score increases by 2.

Succubi mature between the ages of 15 to 18, but can live indefinitely if they continue to acquire souls regularly.

Succubi are generally evil as a result of subsisting on a diet of souls. Evil or not, an independent nature inclines many succubi toward a chaotic alignment.

Succubi range from 5" up to 8". Your size is Medium.

Your base walking speed is 30 feet.

Your creature type is considered to be both Fiend and Humanoid, and you are considered to have the Shapechanger tag. Additionally, you are vulnerable to radiant damage.

You have a small pair of wings that give you a flying speed equal to your walking speed. However, these wings are not strong enough to hold your weight for an extended period of time. You fall if you end your turn in midair.

You can speak, read, and write Common, Abyssal, and Infernal.

As a ritual, you can polymorph into any humanoid of your size that you have seen. However, your equipment does not change with you, and may be damaged or destroyed by this process if it does not fit your new form. You lose the fly speed trait if your current form does not have wings. You may revert to your true form as a bonus action. If you die, you revert to your natural appearance. Your attributes are unaffected by this change. 

You can cast the charm person spell once using this trait, using Charisma as your spellcasting ability. You regain the ability to cast this spell when you finish a long rest.

Additionally, you gain proficiency in Deception and Persuasion.

The Succubus kisses a charmed or willing creature. The target must make a Constitution saving throw against your Charisma Spell Save DC (8 + Charisma + Proficiency), taking 1d10 + Charisma Modifier psychic damage on a failed save, or half as much damage on a successful one, and healing the succubus for the same amount. The number of dice used to calculate this damage increases by one at levels 5 (2d10), 10 (3d10), 15 (4d10), and 20 (5d10). 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 or the Succubus that performed it is killed. After the target takes damage from this attack it can make a saving throw with advantage against any charming effects you have on it. The target dies if this effect reduces its hit point maximum to 0.

A succubus must consume life essence via a successful draining kiss at least once per week, else they gain 1 level of exhaustion every week they go without. If a succubus gains exhaustion in this way, each life essence harvested with a successful draining kiss restores one level of exhaustion.

Your eyes pierce through the flesh and physicality of creatures and peer directly into their soul. As an action, you can study the soul of a creature within 10 feet of you and learn a basic idea of what they truly most desire by making a Charisma check. Some possible desires might be: wealth, love, hunger, knowledge, or forgiveness. This trait has no effect on creatures lacking a soul, such as constructs.