*gently slides my DiaLovers self insert onto your dashes*
Warning, slightly long post. :3
Meet Satomi (left picture, ~17 years old)! :3 She's a normal human who happens to have demonic blood running through her veins, just waiting to be awakened. She was given to the church by her stepfather as a sacrificial bride to the Sakamaki brothers. The ones who take the most interest in her are Laito and Kanato.
After staying with the Sakamaki for a year or two and getting used to life at the manor, Satomi cuts and dyes her hair (right pic, ~19). By this point, Laito and his brother Kanato have staked their claim and Satomi is accustomed to being their plaything. Satomi is coerced by them to wear a deep emerald green or lavender colored collar whenever she goes out, whether alone or not, as a way of the two claiming ownership over her. Kanato also has Satomi paint her nails the same shade of purple whenever feeling especially possessive.
It is during this time that Satomi's blood awakens due to her becoming pregnant with Laito and Kanato's children. She eventually gives birth to fraternal twins, one boy (Kanato's) and one girl (Laito's). (I'll add them below the next part of info.)
After another two years, Satomi finally gets the guts to "come out" to Laito and Kanato and be his true self - dressing more masculine, binding, and even seeking hormone replacement. It takes then quite some time to get accustomed to the change, but they do so easily considering the circumstances. Satomi changes his name to Koichi - the kanji for which means "one light", signifying his relationship with them. (The left picture is how his hair appears when down, the right is how it looks pushed back. He's roughly 20 in these, and this look is current up to present day when he's 24.)
He still wears a collar/choker, though it is now a slightly smaller one, and occasionally has Kanato paint his nails a soft lavender.
Kanato and Koichi's son: left is ~9 years old, right is him as an adult. He takes more after Koichi than anything but he's still adorable.
He's an outgoing, ambitious child who is extremely interested in biology as he ages. He's got Kanato's temper but Koichi's fuse - it takes a lot to get him angry, but once he's pissed you'd better run. He's also been known to have an insatiable sweet tooth, which is something that drives Koichi up the wall.
Laito and Koichi's daughter: left is ~9 years old, right is her as an adult. Yeah she looks just like her daddy don't at me.
She's a small, shy bundle of energy who hides when around anyone but her parents. As she gets older, she shows a fondness for Kanato's style of dress up, often wearing Victorian Era gowns around the house. She has Laito's habit of flirting with boys and girls alike, but her parents never let it go too far.