Again, the next chapter contains more story and this is just me answering questions posted. Any questions that might be constituted as spoilers aren't answered.
Relationships:
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Q: How large is the harem going to be?
A: Issei 2.0 extra boobaloo.
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Q: Sex scenes gross
A: 'Tis a hentai crossover.
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World:
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Q: Where Nazarick?
A: Soon(™).
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Q: Are other pantheons going to get involved/interview Momonga?
A: In time. This fic is already dangling on the thin edge of too many or too little simultaneous characters and plot threads.
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Q:Wouldn't all Kings of Peerages have King Pieces?
A: No, a King Piece is a specific banned Piece that can be used to enhance Kings. It is not a requirement to be a King.
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Characters:
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Q: Is real Issei alive?
A: Relatively speaking.
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Q: Why are Issei and Saji getting NTR'd?
A: Big F in chat for both.
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Q: Are other characters going to get powerups like how Gasper did?
A: Some yes, others no.
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Q: Are there going to be more plushies?
A: Maybe. The crazy train is on a circular track.
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Q: Would the Cherubim Gatekeepers level up?
A: They had only class levels and are now learning job levels, of which they had none previously and thus had 'free slots'. Namely, levels in [Housewife]. How Momonga is going to react to the news is… well, food for the thought.
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Q:Did Ainz rape Sona? Or is Saji just mistaken?
A: Latter. If you recall, Saji&co found 'Issei' with unconscious Rias, Sona and Akeno, and all three girls had signs of bruising, moving around, crumpled clothes after intense hugging and the couch had signs of struggle and tears. It wasn't hard to combine that with Issei's perverted tendencies to produce a… unsightly theory, to which Saji hinted in the next chapter after it. Nonetheless it might have affected his judgement when he learned that his one-sided love, Sona, had been engaged against her will to her 'abuser'.
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Q: Would Momon-Issei's body's children be eventually Momonga's and not Issei's?
A: The corruption spreads.
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Q: What rank would the summons have in Nazarick:
A: The same as in LN's.
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Combat & abilities
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Q: What would have happened if Ainz targeted Serafall with Fallen Down instead of Great Malediction?
A: Ainz would have been forced to use more cash-shop items and risk defeat as Serafall's final water leviathan form essentially nullifies most of the fire damage component of the spell, and due to her not being undead, Fallen Down's main draw, anti-undead component, would just dud. In other words, it'd be next to useless.
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Q: How was Serfall able to move around after getting hit by Great Malediction?
A: She still had 'health' left, or rather devil energy and her body was intact even if both were severely deteriorating. If she hadn't retreated when she did, she would have likely died after the match.
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Q: Did Gasper acquire shapeshifting?
A: A variant of it. A particularly dangerous variant.
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Q:Could Momonga use Promotion?
A:No, unless he was a Pawn in someone else's Peerage. Same applies to other Piece-specific ability combos like Triaina/CC Promotion.
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Q: Could Momonga enhance [Create Item] (variants) with [Boost]?
A: Yes, but with an equal increase in mana cost.
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Q: Could Momonga [Wish] to get specific class levels when [Boosted]?
A: It'd work like a job or class change.
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Q: Did [Reality Slash] sever reality?
A: Altered a thin slice of it. Think of it like an extreme mandela effect localized entirely within a razor-sharp slice, but if it was real and not a sign of early Alzheimer's.
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Q: Could Momonga use Issei's body's devil energy to fuel his abilities instead of Mana?
A: Not really. He could convert the body to mana or experience with [Sacrifice] but that'd be inefficient use of resources at worst and self-defeating at best.
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Q: Could the [Power of Imagination] from the masses boost Momonga's power and abilities unknowingly?
A: If the devils were green, hulking, spoke in british cockney accent, had a teeth-based currency system and this was a warhammer 40k fic. As it is, the devil [Power of Imagination] is a bit more specific than that, as it can be used to change things around the devil using it but it isn't a psychic hive mind fueled by groupthink.
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Q: Does Boost also increase Momonga's health/mana?
A: Not quite. It serves more like a overclock, while [Divide] is more general-purpose debuff. In canon it was match-for-match, but Momonga isn't relying on the sacred gear's abilities like Dragon Shot to fight and thus focuses on using the sacred gear to boost his spell power exclusively.
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Q: Is Momonga under the effect of the anti-divination ring?
A: He doesn't have any YGGDRASIL gear equipped, but is relying on his automatic anti-divination spells for passive defense. Likewise his physical 'host body', that is Issei's body, keeps his natural aura of power from seeping out and revealing his true nature to anyone who bothered to look deeper into the leaking power.
Except during the Rating Game, when the combination of using [Boosted Gear: Scale Mail] and Super-tier spell caused the aura to seep through, causing Sona (and some others…) to see a 'a dark tyrant, a devourer, clad in yellow' when they looked at armor-clad Momonga…
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Q: Is Experience gain tied to a girl when Momonga does the deed?
A: Yes, since the gain is tied to life energy produced, and stronger 'partners' produce more of it. After all, both Momonga and his creation, the Elder Lich-slash-Overlord General both gain experience the same way, albeit their modus operandi is a bit different...
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Q: Could Momonga use [Boost] to increase his own attributes?
A: Technically, but there would be little point to it. Increase in health would also increase the amount of damage taken, increase in mana would increase mana drain, etcetera. [Boosted Gear] doesn't quite recognize where the 'benefits' and 'maluses' of Momonga's 'soul' start and end as he is alien to the world, so it doesn't quite work for him like it did for Issei, who was native to the 'Ero-world'. That's the same reason his spell drain also scales with [Boosts].
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Q: Could Momonga use [Boost] to increase the potency of Phoenix related abilities?
A: In a way. [Regeneration] would become more efficient, but since it only targets Momonga's 'cosmetic body', it isn't really an issue anyway. The fire-based abilities in turn just strengthen his fire-based spells if he used Issei's body to cast them, but since YGGDRASIL-based spells come from 'Momonga' and not from Issei's devil energy, the strengthening wouldn't affect spells such as [Grand Fireball] or [Inferno].
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Q: Would Momonga unlock some of Ddraig's and Issei's late-canon abilities?
A: Some, yes. Most, no. After all, many of the late-stage abilities of [Boosted Gear] came as result of unique training and character combinations that made them possible. In the same vein, Momonga's version of the canon might introduce some new combinations, and already has...
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Q: Could [Boosted] [Wish] eventually rival World-class item [Ouroboros]?
A: Yes, but one would need to be very, very, very careful as to what to ask of it.
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Q: Could Momonga get access to [Boosted Gear]'s innate abilities like [Penetrate] or [Transfer]?
A: He already has, just hasn't used them as he's trying to keep the possession of the gear a secret from the public. He did, after all, read Ddrag's memories of the gear and also analyzed the gear itself. However, while in canon it took Issei's stamina to use the abilities, in Momonga's case fueling the abilities might require a different resource...
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Q: Could [Boost] increase the potency of [Negative Energy Touch]?
A: It would increase its transfer rate. After all, [Negative Energy Touch] is more like a healing channel for an undead target, and a damage-channel for a living target.
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Q: There's a lot of netorare in this fic despite promising otherwise.
A: Netorare? No, not in my opinion at least. Netori? Definitely. Which is Netorare, but the protagonist is the one doing the dirty. One may call that a trick, others call that subversion of expectations.
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Thanks for reading!