Into Nikki's brain Puny Pervert chapter 6 by dellobenedetto

After discarding your clothes in a nook of flesh you knew would keep them secure no matter how Nikki moved in her sleep, you began walking deeper into her ear. Making your way past the eardrum via a little hole you discovered in the side, carefully traipsing past the eustachian tube that would send you sliding down to her mouth had you been less careful, and gently brushing up against the tiny bones that allowed your sister to hear. After squeezing through a tight tube, accompanied by her subconscious mutterings, you found yourself in front of a glorious mass of wrinkled, pink flesh—Nikki's brain. _"Jackpot..."

As you clambered up the squishy pink surface, you could already feel twitches and shudders coming from Nikki's body. Just imagine how it might feel once you're fully in position! Eventually, you made it to the canyon separating both halves of the brain, descending a little ways into it before lying prone—letting as much of your naked body touch her cerebral cortex as you could. You didn't expect much to happen, but you stared ahead, a panel of blackness... for lack of a better word, "appear" in front of you, knowing perhaps instinctively that this was your view of Nikki's eyesight. It didn't take long for her sleepy mind to begin communicating things to you quietly in her voice, telling you every facet going on in her body. It took a few more moments for you to filter out only the things you needed, and once you did that, you were ready; squirming within her brain, eyes forward, prodding every bit of grey matter you could reach to wake her up...