Succubi/Incubi are ageless demons, typically reaching adulthood between the ages of 15 and 19 and will not die of old age.

Being a type of demon, they are limited greatly in their alignment. Their very nature dictates that they must take life in order to live. They are never good and are, at best, fully neutral.  Most are some variation of chaotic or evil.

Their true size ranges from 5 feet to 8 feet. Your size is Medium.

Your base walking speed is 30 feet. You also have a flying speed of 60 feet.

While you were born with a gender, your ability to shape-shift allows you to appear as any gender. You use lust as a way to seduce your prey as whatever gender is convenient in the moment.

Incubus/Succubus are fiends, and as a result suffer Vulnerability to Radiant damage. In addition their heritage prevents them from adopting divine classes. You cannot take levels in Cleric, Druid, Paladin, or other Divine classes.

You can use your action to polymorph into a Small or Medium Humanoid Creature using this trait. You regain the ability to do so when you finish a long rest. Without wings, you lose your flying speed. Other than your Size and Speed, you keep your statistics in each form. Any equipment you are wearing or carrying isn't transformed with you, and may suffer damage if you transform into a different race. If you are transformed you may decide to revert to your true form without expending this ability, or you are incapacitated. You may use this trait twice at Level 10, and three times at 20th Level.

You can use your action to charm a humanoid within 30 feet of you that you can see. The target makes a Wisdom saving throw vs your Spell Save DC, or they become charmed for 1 day. If the target suffers harm or is given a suicidal command, the target may repeat the Saving Throw, ending the effect on itself on a success. You can charm creatures with a CR equal to your Proficiency Bonus. After passed, or if they succeed the saving throw, the creature realizes they have been charmed and cannot be charmed by you for 24 hours after they were charmed. You can use this trait a number of times equal to half your Charisma modifier (a minimum of once). You regain all expended uses when you finish a long rest.

The fiend ignores the range restriction on its telepathy when communicating with a creature it has charmed. The two don't even need to be on the same plane of existence.

You have Proficiency in the Persuasion skill. You have advantage on saving throws against being charmed.

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

Your Charisma increases by 2 and your Dexterity increases by 1.

Because you are a fiend, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.