Kiba Inuzuka
Kiba's mother is a well-trained kunoichi in every sense. She's an Inuzuka, so she of course a gifted fighter. Her three nin dogs are also exceptional. They also have not always been with Tsume.
Tsume is not extremely attractive, but rather follows the usual Inuzuka pattern of a large build, scraggly hair, and abnormal eyes. Surprisingly, this makes her an ideal kunoichi for missions of seduction that involve men who have unique tastes.
Tsume was trained to dominate men. This is natural in her clan, and apparently she took to the training like . . . well, a bitch in heat to a lovely male beast. She entered the training with a bit of reluctance, but Tsume wanted a family, a big family, and she quickly realized that being a normal kunoichi who just kicked male ass might hold her back. When her mother suggested the opportunity to control a few males as a strong dominatrix, Tsume accepted. Her mother was the one who actually withheld the standard Inuzuka tattooing until Tsume graduated and decided her konoichi path.
Tsume was only twelve and just out of the academy when she started learning. It's surprisingly normal for Inuzuka to enter puberty early, and Tsume was no exception. She was err . . . mature.
Tsume took extra training for just over a month before she was actually deemed "better than me" by the only true dominatrix in all of Konoha. Akamaru's mother was mildly pissed about being neglected, but one month was certainly better than the three years expected. The training was much faster than anyone anticipated, including those who assigned these special kunoichi missions. Tsume was still only twelve, so no one really felt comfortable sending her out, even if she was more developed than most sixteen year old female ninja (and certainly taller than all of them).
Poor Tsume was stuck on a genin team with a non-dominantrix jonin sensei for three years before anyone felt that she could be sent on the type of missions that she had been groomed for. During those three years she did manage to lose her virginity, practice her special skills, and of course gain chunin before her other two "standard" male teammates. Her dominating personality and the fact that she controlled their team might have had a role in their lack of development. The poor fools, including her sensei, had no idea what they were dealing with. Seduction konoichi are well-guarded secrets.
Tsume's first mission was a stunning success. She was sent to Suna to seduce the Kazekage himself, well, the future Kazekage. The man that would be Kankuro, Temari, and Gaara's father was always silent and boring. He had interesting cravings, and adored women who controlled him. He had too much power, and strangely didn't enjoy having women bow down before him. He liked it better when they bit back, at least in the bedroom.
Tsume spent six months in Suna establishing herself as a prostitute before the first time that the future Kazekage came to see her. He heard about her special brand of service from an extremely well-satisfied
chunin who worked in the then-current Kazekage's office. Needless to say, Tsume pleased both men.
Tsume spent another two years pumping the Kazekage for information under what would be called torture sessions by many normal people. For the future Kazekage, they were a huge turn on. He told her much more than he should, but it was all part of the weird game that he (and Tsume) enjoyed.
Tsume managed to reach eighteen before being recalled to Konoha. The poor future Kazekage was extremely disappointed, but he married not long after Tsume left. His wife was also an extremely capable women and had an extreme temper. She'd prove it years later when naming her last son, Gaara, and cursing her husband's future.
Tsume meanwhile had no idea that she was pregnant until she returned home and her faithful canine companion, who was thrilled to see her, announced his findings to her whole family. Needless to say, they were all thrilled, especially Tsume's mother. She managed to return pupped, and Inuzuka love children.
Hana was born after just six months (gestation for Inuzuka is complicated and won't be divulged here), and Tsume was back to being a normal chunin within another month. Her family took care of her pup , and she figured that she'd act like a normal Inuzuka chunin for a while.
Tsume got the red Inuzuka clan trademark tattoos and proceeded to rejoin her old genin cell, who had thankfully reached chunin status also. Hana stayed home while her dear ol' mum ranked up some interesting missions for both of her skill sets. Tsume's fiercely loyal family of the canine and human variety cared for her kid most of the time, but Tsume of course was a loving mother whenever she managed to stick around for Hana.
Tsume was eight when Tsume again went on a mission to reintroduce herself to the Kazekage. He was the Kazekage now, so Tsume had a slightly tougher time pulling one over on him. He had two kids though and a surprisingly boring sex-life, so when he heard about his favorite girl being back at his favorite brothel, he wasted no time heading over.
He was more tight lipped than before, but Hana managed. She did have to spend three years there to get the information that she wanted about the Sand's new jinchuriki and was appropriately horrified by her mark's plan. She didn't stay in Suna long enough to see the plan come to fruition and her child's third half-sibling be born.
Tsume made it home to Konoha without a proper goodbye for the Kazekage. Tsume was carrying his child too and she had no intention of letting her son become a jinchuriki. Nor did she plan on giving her life for that horrible event. Kiba never knew how close he was to being just like Naruto, but his mother's insistence that he not be a complete ass to Naruto (since she knew how close Kiba was to being just like him) allowed for the quasi friendship that Naruto managed with the dog boy.
Tsume never met the Kazekage again, and he never knew that he had two additional children. Tsume stuck around with her second child a bit more, and managed to rank up to jonin. Her son was funneled into the academy, but her daughter barely finished before focusing on her dream of becoming a veterinarian. She showed a lot of promise in both aspects of her mother's career (she was the daughter of a kage level ninja), but she really wanted to pop out a bunch of pups. Her nin dogs had no complaints.
The Sand siblings have no idea that they have two additional siblings, but the two Inuzuka actually figured out their parentage. They have nin dogs, and nin dogs don't like to keep quiet about stuff like that. Dogs, much like the Inuzuka, are not tactful. Neither Hana nor Kiba had any idea who their father was until Kiba accidentally got too close to Temari and Akamaru warned him about relations with relatives. Nin dogs can smell relations, especially when they're very familiar with the scents. No one understands them really (the dogs), except the Inuzuka, so the Hokage didn't really mind when Tsume confessed to Tsunade that her children figured everything out.
Tsunade was also drunk at the time and appeared to have never read that particular mission briefing and was probably ignorant of the whole thing.
Never the less, Inuzukas are fiercely loyal to Konoha (they're dogs after all), so Kiba and Hana both wanted nothing exposing their relation to the Sand, their Kazekage, or its ninja, even if they are the children of a kage and all of the bragging rights that could be theirs. They could also just be using these prejudices as excuses to avoid any relation to the guy who reminds them too much of a cat (or the one who still smells like blood and raccoon).
