Teen Sister LF Older Teen Brother (OPEN)

The only counterpart I am interested in is a brother, either half or full siblings only. Full sibling preferred. For the brother I want him to be close in age but older. Ideally 3-5 years but not a hard requirement. Could be fun to have them in the same high school together.

Name: Koharu (willing to Americanize but prefer Japanese setting)
Age: 14-16
Bra size: 30C
Height: 5'3"
Body size: petite
Personality: Brat to her brother. Sweetheart to everyone else. She a popular girl
Hobbies: Teasing her brother, spending time with friends, beauty, shopping, researching sex appeal, masturbating
Kinks: exhibitionism/voyeurism, first times/virgins, incest, mutual oral, vaginal sex, teasing, handjobs, fingering, teen sex, cnc
Possible/Optional kinks: lingerie, cosplay, toys, double penetration, cum play, squirting, stockings, feet, pet play, cheating

Up until a few years ago Koharu and her brother were your average siblings. She being the younger one looked up to him, but one day something happened and everything changed (this is up for discussion. Perhaps one day he rejected her (maybe he had plans with a girlfriend) and since then she has wanted him to suffer. Or his friends told him hanging with your little sister wasn't cool, so he did something to prove his coolness to them.)
Current day, Koharu teases her older brother a lot believing she can get away with it. It starts off small, suggestive remarks and wearing revealing clothes. Eventually, she tries even riskier teases like flashing her panties and sending him suggestive photos. She wants to make him want her so bad it hurts as revenge. Because as her brother, he would never cross that line. Eventually, she pushes her brother too far and he "forces" himself onto her (she's into it but tries to pretend she's not at first).

If you are interested DM to discuss details first!