Part 3, enjoy. :3 I was hesitant to continue, but I still am. :3

Itachi walked softly through the halls of the base rubbing his bandaged arm. The last mission was tougher than he anticipated and there was nothing about a possible ambush in the briefing. His damp stirrups squished beneath his feet on the wood. The base was quiet and abandon except for two chakra signature above him. He could tell the comparably fainter one was the help's and the other now raging and viciously unstable one was his beloveds. If a shinobi wasn't well trained in sensing chakra pulses like him, they could never predict how over their heads they'd be in entering here to battle. However, the raging chakra source was unusual from any regular shinobi to interpret as normal. He had inferred since the chakra source had begun to elevate in proximity to him, that he was in a mess of trouble as soon as he got up to his apartment.

Slowly turning the knob and pushing inward he crept into the dim apartment. There was no sign of him anywhere yet the whole place was overwhelmed with sporadic debilitating chakra. He was mildly concerned.
"Sasuke...?" the apartment remained dim and lifeless. He began to walk forward when a rustle of fabric came from above him. He was surprised and skeptical to accept a shinobi of that condition could get up there but, finally he looked up in the split second to see his brother launching himself at him from the ceiling above. A whole ton seemed to have pounded him into the floor.
"It took you long enough! You left me here alone for almost a month!" Sasuke looked not only enraged but he seemed to be fighting back tears above him. He dreaded how emotionally dependent Sasuke had become towards him. He began rubbing his strained back on top of him.
"Are you ok..."
"Yes I'm okay! What took you so long, Aniki..."
"It's only been two weeks..." he felt a little annoyed that he could loose track of time just staying in this small apartment or trying to exaggerate so that he could pity him but, he did worry.
"It doesn't matter. Undress already." Sasuke shoved up his shirt with warm soft hands and he began to worry what the little monster inside had made him become.
Time slowly passed as he took in every moment of Sasuke's familiar and strange antics like sudden waking morning trips to the bathroom or taking a snooze on the hard wood floor whenever he desired. Sasuke had begun to wear his baggy shirts that only began to cover the navel of his swollen gut. Sasuke also began to claim his lounge pants that were only a few sizes larger in difference yet, unable to manage fitting him correctly as well.
Itachi grew more worried each time the curse mark would glow purple whenever Sasuke decided to go through an emotional hissy fit. The chakra surges started to agitate his birds so much he quit summoning them within the short month Sasuke moved in with him. Every time he left for a mission and returned, Sasuke tackled and squeezed him dry. The sex was longer lasting and hotter but the condition Sasuke was in terrified and worried him while in the act.
Sasuke took to other strange cravings leaving half of the food he brought home inedible. Tomato sauce covered chocolate teriyaki puffs killed his appetite every time he allowed him to cook and stunk up the kitchen badly.
Everyone obviously knew he was hiding a special someone in his apartment thanks to all the loud love making moans and screech sessions accompanied by horrendous floor and wall shaking action. Weekly Go matches with Kisame were sacrificed to put up with Sasuke's weekly mood swings instead. Random love tackles even went into his personal time of manicure and painting his nails. To take further precautions to curious interventions, his death threat towards Deidara kept mostly everyone distant and in the dark. Tobi as expected relentlessly keeps trying to get into the apartment always catching him at the door to try and get a glimpse of his so called 'lover'.
"Sorry, Tobi-San, not today. You'd catch a cold if you entered now..." He would say and despite his excuses he knew there were many forced entries while he was away. Sasuke luckily was skilled in hiding even in his current state as he practiced often with surprise love tackles from above. Although, knowing of a more malicious side to Tobi, Itachi knew Tobi would kill or kidnap Sasuke and raise the child with sinister intentions. Itachi still hadn't planned where to take Sasuke when the time would come or how they would actually raise the child. Judging from the current state and determined roughhousing Sasuke could come into labor at anytime if he kept pushing it.
The glowing curse mark that rippled on his brother's pale skin even during sleep caused great distress to him. He could only imagine what negative effects it could have on the baby. He remembered back to haunting experiments of Orochimaru from earlier times when he was a member of Akatsuki. The bastard was lucky he only lost a hand when he tried to incorporate an experiment onto him. In the time after Orochimaru fled the organization, he was uncertain in leaving Sasuke alone to fend for himself but, work was tying him down to other things like gathering more members after that.
Staring at the Uchiha emblem on the back of the shirt Sasuke was sleeping in now gave him an inescapable idea. Tomorrow they would move to the hidden Uchiha base that lay barren on the outskirts of the border and seal away whatever evilness Sasuke was possibly bearing inside. That way he could finally sleep more peacefully at night without sudden zaps of lightening streams or pillows igniting during the night.

He awoke breathing heavily from a nightmare of earlier times. It had been so long that these ideas crossed his mind. He was sleeping next to the killer of his mother and father however his heartbeat had already slowed back into a resting state. There was a hidden agony gnawing at him yet he was perfectly calm. Often he had contemplated killing him but only managed a harmless zap or setting a pillow on fired. He was unsure of the child's future he was in charge of but he wondered what his brother would do once he had it. He had dreamt of running away long after he knew he conceived but there wasn't really any shelter he thought of residing to except coming back to his brother.
After the desperate few months of finally tracking him down, he still felt there was amiss in his plans. The little fellow was kicking at his insides as he turned over in the small bed to face his brother. Things hadn't turned out for the worst so far and he still had his goal in sight. What could possibly go wrong now?

Itachi awoke to a blast of concentrated chakra with a sense of urgency. Sasuke was standing near the bedroom door in defense with a kunai. He grabbed the hidden katana under the bed and leaped over to join the sudden instinct of danger.
"What is it..." he whispered unsure what was going on.
"Someone's here..." Sasuke seemed thrilled.