Oath of Love.

Paladins of Love both exemplify and go against what one thinks of when they envision a Paladin.
They are known to be extremely committed to their cause, but what fuels their commitment is not a sense of morality, or a divine sense of justice, but rather their very own feelings. Paladins of Love reject the idea that to be a holy warrior, one must be unfeeling in the commitment of living their life according to an oath. Their oath itself relies on the love that inspires them to swear by the tenets they follow. To them, loving eyes are the only eyes not clouded by superfluous ideals and morals.
Paladins of Love choose a beloved—or rather, their feelings choose for them. A Paladin’s beloved, what they love most in this world and all the others, is the source of their power. Most Paladins’ beloved are people. Parents gain magical abilities by swearing an oath to love and protect their child, or lovers battle together and use their love for each other as the force that guides their blows. Other Paladins of Love, however, find their beloved in a deity, or a place, or a group of people, or a concept. Paladins of Love are not interested in questions of morality, and are not required to find a beloved that is ‘good’—they are only required to love the object(s) of their affection unconditionally.
As long as the Paladin feels an extremely powerful love towards their beloved, they can swear the Oath of Love and become what is commonly referred to as a Knight of Hearts

Level 1 Features:

Tenants of Love.

The tenets of the Oath of Love hold the feelings of the Paladin as what is most important. Their commitment to protect and cherish what they love, along with their vows, pushes Paladins of Love to feel strongly and proudly.
Love Unabashedly. I desecrate what I love by being ashamed of my feelings. I will wear my heart on my sleeve and love proudly.
Love my Beloved. Those whom I love and those who love what I love are my beloved, and I will be their sword and their shield.
Love is Sacred. If anyone or anything loves strongly, I will respect their affection and their feelings and help their love flourish, no matter how different from my own feelings theirs are.
Love Makes us Better. No matter the circumstances, I won’t let my love waver, for it strengthens not only me, but also all of my beloved.

Level 3 Feature:

Oath Spells.

Each oath has a list of associated spells. You gain access to these spells at the levels specified in the oath description. Once you gain access to an oath spell, you always have it prepared. Oath spells don't count against the number of spells you can prepare each day.
If you gain an oath spell that doesn't appear on the paladin spell list, the spell is nonetheless a paladin spell for you.

Channel Divinity: Loving Embrace.

You can use your Channel Divinity to uncloud the feelings of a loved one, returning their mind and body to their control. As an action, you touch a creature. The creature is immediately free of any of the following conditions: Charmed, Frightened, Incapacitated, Paralyzed, Petrified, and Stunned. The creature is also free of any other effects that negate their free will, such as possession.

Channel Divinity: Galvanising Affection.

You can use your Channel Divinity to channel the strength of your love into an inspiring, rousing cry that empowers your loved ones. As an action, you present your holy symbol and choose a number of willing creatures (that can include you) equal to your Charisma modifier. For 1 minute, these creatures add half of your Charisma modifier, rounded up, to their damage rolls.

Level 7 Feature:

Aura of Love.

Starting at 7th level, you can empower your allies, and especially your beloved, with your love. When a Friendly and willing creature within 10 feet of you makes an attack roll, you can use your Reaction to add your Charisma modifier to their attack roll.
Additionally, you can use your Bonus Action to select a Friendly and willing creature within your aura. This creature is now your beloved, and enjoys a number of bonuses while within your aura:
-They add your Charisma modifier to one of their attack rolls per round.
-They gain a +1 bonus to their AC.
-They are instantly stabilized if they are reduced to to 0 hit points.
The creature counts as your beloved for 1 minute or until they leave the radius of your aura.
At 18th level, the range of this aura increases to 30 feet.

Level 15 Feature:

Empowered by Love.

Starting at 15th level, you become stronger when fighting side by side with those you love. When the Friendly and willing creature you have selected within your aura as your beloved is within 10 feet of you, you enjoy the following bonuses:
-You add a +1 bonus to all your attacks and damage rolls.
-You gain a +1 bonus to AC.

Level 20 Feature:

Knight of Hearts.

You become the living embodiment of the love you feel so strongly, which gives you and those you love the following benefits:
-You can choose a number of Friendly and willing creatures equal to your Charisma modifier as your beloved. They all enjoy the same bonuses while within your aura.
-You add a +2 instead of a +1 to your AC, along with all your attack rolls and damage rolls, as long as there is a conscious beloved within your aura.