Top 10 Fanfiction Occurrences of One or More Characters Sneaking Into Another's Brain Via Ear Canals
Makes her dance nakedly to the Mew Mew Kissy Cutie theme and get down and dirty with the Amalgamates in public while fully aware of the fact that she was inside her head, enough said (the fact that she initially manages to effortlessly sneak her way in completely undetected due to Alphys horribly underestimating her STUPIDITY rather than intelligence just adds to the sexiness)
The way that Toriel reacts when Asriel starts making out with her outer cerebral cortex (while it's being recorded on live T.V.) is just plain hysterical
Gets shot into one ear like a spitball by Undyne, then flies right past the brain into Catty's other ear, causing Catty to notice Alphys' presence and attempt to pound her out through the OTHER ear, at which point Alphys falls all the way BACK through Catty's head and desperately clings onto her canon-defilingly misplaced hoop earring for dear life...
before finally letting go of the blissfully unaware Catty's earring and plummeting straight back down her ear canal into her brain center, at which point she publicly picks her nose all the way INTO said brain to try and fish Alphys out (during a straight-up presidential election between her and Bratty, no less)...but then she accidentally pokes herself in the brain and paralyzes herself from head to toe, giving Alphys ample time to scamper straight up her outstretched index finger and agonizingly painfully burrow into her frontal lobe and therefore gain access to her shockingly complex central nervous system.
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Besides the fact that he crawls all over Lammy's brain like an ant (and is even able to literally hear her personal thoughts emanating from it as he fervently makes out with every last square inch of it) while she herself is disgustedly forced to watch, the fact that he takes a literal diarrhea dump in her ear (all over her eardrum, no less) is also rather amusing to say the least
Really nice contrast between the two halves of this scene; for the Muffet portion, Muffet VERY deftly and quietly sneaks her way through the ear canal into her blissfully unaware, fast-asleep victim's brain, even causing Toriel to slip even deeper into her subconscious dream state as Muffet's bare, dainty little humanoid spider feet relaxingly pitter-patter against her external and more noticeably internal brain tissue...
Meanwhile, the Asriel portion is VERY much the EXACT opposite, with Asriel literally FLYING straight through his victim's ear canal at Superman speed and busting right through her poor defenseless eardrum, from which point things only continue to become even more agonizingly terrifying for the poor anime-obsessed thing
Also somehow manages to sneak his way in completely undetected (amidst a huge assortment of wax-coated insects), from which point he then proceeds to viciously attack Godzilla's neural transit center with his lightsaber until there's literally nothing left of his poor building-sized brain except for the stem
Mind-controls her into dancing a Godzilla-sized Careless Whisper duet with Mettaton in the middle of New York City, enough said
Yet ANOTHER scene where the intruders make their victim dance a Careless Whisper duet, only this time it's with Burgerpants and is set in the middle of Snowdin (also, the part where they repair his conscience wires is indeed rather hot as well)
Even goes as far as to lay eggs in his hypothalamus
I SO wish you could do this in the actual Minish Cap (drools)