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

Incubi and Succubi reach full maturity by the age of 18. They cannot die of old age.

Incubus and Succubus often tend toward evil alignments. Neutral or good Concubi are extremely rare, but not unheard of. They have no particular tendency toward or against lawful or chaotic alignments.

Concubi are about the same size and build as humans. Your size is Medium.

Your base walking speed is 30 feet, you also have large bat-like wings, which give you a flying speed of 60 feet. You only have a flying speed of 60 feet if you are in your true form, and if you are wearing light armor tailored to your wings. If you are wearing medium armor, your flying speed is 30 feet. You cannot fly wearing heavy armor.

Thanks to your infernal heritage, 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.

You have resistance to fire and poison, but vulnerability to radiant damage.

A creature of deceptive words, Concubi have proficiency with Persuasion and Deception.

You know the draining kiss cantrip. When you reach 2nd level, you can cast the charm person spell as a 1st-level spell once with this trait and regain the ability to do so when you finish a long rest. When you reach 7th level, you can cast the polymorph spell once with this trait and regain the ability to do so when you finish a long rest. Charisma is your spellcasting ability for these spells.

You can use your action to change into a medium humanoid form, or back into your true form. This form can mimic any normal humanoid, such has humans, orcs, tieflings, and elves. Without wings, you lose your flying speed. Other than your size and speed, your statistics are the same in each form. Any equipment you are wearing or carrying isn't transformed. You are considered to be a Shapechanger or a Shapeshifter for the purpose of spell effects.

If you die, your corpse reverts back to its natural form.

When in your humanoid form, you are considered humanoid; when in your true form, you are considered a fiend. Certain spells and effects that specifically deal in detection will always count you as a fiend, these include Detect Evil and Good and a Paladin's Divine Sense.

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