Succubus/Incubus

You come find a Succubus/Incubus that fell in love with you, and you were in love with the Succubus/Incubus so you made a bond.

Succubus/Incubus summoner

You can summon a Succubus/Incubus to help you as a action.

Talk to your GM about XP being docked.

Succubus/Incubus's charm

Charm. One humanoid the you can see within 30 feet of it must succeed on your spell save DC saving throw or be magically charmed for 1 hour. The charmed target obeys the you verbal 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 your Charm for the next 24 hours.

For every level you increases the duration by 2 hours

Succubus/Incubus's Draining Kiss

Draining Kiss. when you kiss a creature charmed by it or a willing creature. The target must make a spell save DC Constitution saving throw against this magic, 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. You can use this trait 5 times.

Once you use this feature, you can’t use it again until you finish a short or long rest.

You can use it 1 extra time per a level past level 6.

Succubus/Incubus Resistance

You gain resistance to Cold, Fire, Lightning, Poison; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks

Joined as one.

You and Succubus/Incubus are joined as one. When this occurs you take all of each others best traits for example if you have +5 in charisma draining kiss does 5d10 + 5 + proficiency bonus, and you can do it infinite times.