Character design, reference sheet, and mark by Rinikka.

Heart and Soul are female earth pony identical twins, who are very close with each other.

They went to medical school together.

So close, in fact, that they have sex with each other.

Heart

Preferred name: Heart
Favorite thing: Wine-infused dark chocolate
Favorite ice cream flavor: Chocolate

Heart is extraverted, flirty, casual, carefree, sometimes overbearing, and spontaneous. She likes to nudge others outside of their comfort zone, for example dressing her sister Soul up with bows. She gets jealous easily, and is the tiniest bit manipulative, though not intentionally.

She's not afraid to leave her mane as its messy default when she goes out, but will put effort into it if she feels like it.

She likes horror, frights, and scary stuff. Frights especially also turn her on.

She is a trained medical professional, working in Aeroville as a general practitioner (doctor).

She loves wine and she loves dark chocolate. Her favorite food is wine-infused dark chocolate.

She is protective of her sister Soul, and will stand up to anyone who insults or attacks her.

Sex life

Heart is the sort of pony that, if she wasn't in a relationship, would be sleeping around a whole lot, randomly making out with ponies in public, and often coming home late after a night of sex. This lifestyle was one reason why her mane is so messy all the time.

She's usually the dominant aggressive one in sex. She is open to many kinks, though Soul is more actively kinky.

Soul

Preferred name: Soul
Favorite ice cream flavor: Vanilla

Soul is more introverted and reserved than her sister. She wears her hair in a ponytail.

She is fairly laid-back, careful, and is subtly mischievous, but she still can get worked up over things.

She is a gymnast and contortionist, and so she is physically very flexible. She does yoga often.

She is also a trained psychiatrist and counselor, working in those roles in Aeroville.

Sex life

Soul is the "quiet but kinky" type. She is into many things and loves to explore new ones.

Her flexibility often leads to her having sex in odd positions. She loves being held in many very unique positions. Her flexibility also extends to being able to take large insertions with relative ease.

She has very sensitive erogenous zones, and can even get off just from lewd thoughts. She can't last long during sex, but more than makes up for it by being able to have many, many orgasms in a row. And, she is a squirter.

She is also a bit of a masochist, and she can cum fairly easily from being spanked.

Relationship

The twins are in a four-way relationship with the Galaktika siblings. Apart from the bond between the twins, Heart is closest to Stormfront and Soul is closest to Andromeda.