Originally. An odd word. It applied to Biwako Sarutobi in this manner: her name was originally Akusa Senju of the Uchiha. She was the bastard daughter of Tobirama Senju and Ayano Uchiha, younger sister of Tajima Senju. She chose Biwako the day after her mother died. Ayano and Akusa had fought back to back, driving away nin from newly-formed Iwa executing a poorly thought out but succeeding swarm attack.
"Akusa, you know what to do." Her mother's soft instruction in her ear, she grunted the affirmative, swallowing her terror. When her mother roared
"AKUSA, NOW!" Akusa closed her eyes and erected a chakra barrier, unable to watch her mother use her Mangekyo Sharingan: Shinigami. Tajima's gasp preceded their father's scream of agonized rage by moments.
Akusa had opened her eyes to watch the effect of the Sharingan dissispate, even as her mother slumped to her knees, tears of blood tracking down her cheeks. With a final bullheaded effort, Tobirama broke his daughters' barrier to cradle his dying beloved to his armoured chest. Every other nin froze when the silver Senju let out a second uncharacteristic wail. Tajima was suddenly being pushed forward by Inosha Yamanaka, who bore a worried expression. Her father's prize student, his Saru, was suddenly at her elbow- she was in shock, she realized- as Hiruzen lifted her, bloody armour and tears streaming down her face, to take her to her parents, Sarutobi kneeling beside Tajima to mirror his sensei, draping the woman in his arms across his chest. Ayano lifted her hand.
"Akusa, thank you. You gave me the time I needed." Looking up into her mother's contented smile but not daring to look into her father's eyes, Akusa trembles
"Kaachan-" Aya lets out a rattling laugh and whispers
"Saru will love you, my girl. Let him." Turning to her son, she ordered
"Inosha is a lovely girl, my Tajima. Treat her right." Her body shudders, but Aya tips her head back to murmur to Tobirama
"Love you, 'll wait . . . for y-you." Tobirama kissed her forehead.
"Do that, Aya-chan." His heart is in his words, the breaking of it evident in how his voice- usually unflappable- cracked.
She makes love to Hiruzen that night, she later swears to herself that's the night Aishiteru is conceived. He calls her name over and over and over again. Like it is the only mantra he needs. Perhaps that's why she never says anything after their marriage, when every time they make love, he calls her Akusa. She talks to her father, and her brother, but knows nothing will save Tobirama.
He returns from his mission to find his formerly lithely muscled kunoichi with bigger breasts, wider hips and a distinct pouch in her casual nin clothes- her father has forbidden her any duty until well after the birth. She braces herself for the rejection she believes is imminent. Instead she receives a dose of déjà vu when he sweeps her off her feet, first into his embrace, then his kiss, ending in a thorough loving in his bed, when he tells her, rather breathlessly, that he loves her, and he can't wait to be a father. When he peppers the bump on her stomach with kisses, Biwako blushes, gasping when the baby kicks, recognizing her father.
He must beg, and trade missions, but eventually, he convinces his leader, his wife, and his teammates to let him stay with her while she gives birth. Koharu looks disgusted, Homura is unsure, but Tobirama-sensei gives him a nod of approval. The closer she comes to her due date, the more Biwako changes her mind, she wants him with her. It is the last that relieves him, although his sensei warns him she will either not talk much, or curse at him. The day she delivers their daughter, straining under the pain, is a day of perpetual terror for Hiruzen, who sits behind her, bracing her back as she pushes. But it is nearly worth the pain she endured, to hold Biwako as she nurses the child he sired.
When Katsu, their oldest son is born, Aishiteru is beginning her own family with another Uchiha. Biwako lives to see Katsu marry and produce Konohamaru, to outlive her eldest grandchild, Nejimaru, meets her eldest great-grandchild Neji Hyuuga, watches Aishiteru and her husband throw their lives away to save her, watches as Amaya marries the Hatake whelp, but she can't shake the exhaustion that takes her over when Amaya brings home her wards. The revelation that her beloved granddaughter is pregnant, and then fighting a war they cannot assist her in is what does Biwako in.
Hiruzen spends every day in mourning of his Biwako. Obstinately refusing any offers for anything resembling a relationship, even from Koharu, Hiruzen meditates to the smell of her favourite incense, looks everywhere and sees at least one memory of her every day. Some nights are spent quietly weeping for his Akusa, but not many.
Asuma does not need to be told his mother was a great medic, but Hiruzen does explain how her mother's death motivated her to excellence. He takes the time to tell his son of his mother's pride, and is gratified to find Asuma listens. But he is not ready to hear what Hiruzen needs to say about relationships.
He turns to his grandson in law, Kakashi for that. Kakashi listens to his every word, never once brushes off a tidbit he wants to share. Often, the talks are held while the Hatake's silver haired eldest hovers, her black haired baby sister held in a loving grip.
Hizashi too, listens when he can. Not often, now, what with raising Neji himself, but often enough until his own death. Hiashi does not know of the relationship and so disallows the Hokage to associate with his nephew. That does not mean Hiruzen has not tagged Neji's file.
Akita, Nejimaru, Aishiteru, Katon and Katsu are dead several years, Amaya is away at school, and two young Uchiha boys have decided to protect her wards, as well as a certain Anbu deciding attaching himself to a great-granddaughter of the Hokage is a good idea.
So Hiruzen pours himself into Naruto Uzumaki and the grandchild he can see, Konohamaru, into Amayas' get, and if he is not happy, if he wishes to just once more experience his wife orgasming under him, he is content. When Orochimaru brings unsavoury shadow dealings to his attention, he remembers that of his students, Orochi was his Biwako-chan's favourite, that unlike his teammates, Orochimaru has never left. So he explains to the man he and Biwako have only ever seen as another son, why he did not pick him for Hokage- Biwako had watched her father slip away after her mother's death, had he not been a wartime Hokage, he surely would've buckled under his duties- that, in his grief, he had only seen those who were young enough to truly need him or those travelling the same path he had been. Orochimaru took it all with good grace, and admitted his own parts in those same unsavoury dealings, and when Hiruzen begged for another chance to know his student, Orochimaru decided to honor Biwako's wishes that he not be a Kage, but assist her husband.
It took time, but Orochimaru and Hiruzen reached an accord, helped along when Amaya demanded Kenjutsu instruction from her grandfather's student. Again, it was Amaya who rescued a Konoha nin from rumours and dirty looks in public by proclaiming
"Oro-ji is the best Sannin, he's awesome with a sword, and he never left Konoha!" Obligingly, Kakashi chimes in
"His loyalty is comparable to my fathers'." Hizashi's statement, made well before his death, is to request Orochimaru be his son Neji's godfather. With Oro knowing Neji is the grandson of his sensei, he agrees, and ends up having Neji dumped on him twice a week. By the time he is talking, Neji's favourite words are
"Tousan, Oro-jiji, Inu and Saru." Several ladies are practically cooing when the young Hyuuga charges his grandfather shrieking
"Jisan! Saru-ji! Me want Oro-jiji!" Scooping him up, Sarutobi bounces him in his arms, and Hiashi, Hinata in tow, is in time to watch the Hokage croon
"Now, now, Jinushi, you know better than to scream for Oro-jiji, he doesn't let you play with the snakes if you holler." Hiashi's face pales at the mere idea he is keeping the Hokage from his grandson.
Orochimaru slithers from the crowd to steal Neji, inspecting him with lazy golden eyes. Anko, enthusiastically horsing around down the street, comes running when Orochimaru calls over his shoulder
"Anko, come meet my godson."