Shell's memories are going to be perfectly accessible, but they will not come up automatically in response to stimuli unless the resulting Shell Bell is expressly open to it. They will keep Shell's hard-earned tolerance to pain, insofar as that's separable (Shell is quite sure that she'd be able to make a pentagon if another situation as important as getting ahold of Sherlock to mint Juliet came up). All of Shell's insights about Sherlock's importance stay. Her itchy discomfort with Sherlock not getting her importance will be folded into Bell's resignation to same. The merged Shell Bell will be comfortable referring to either past in the first or third person, but will default to using "I" for Bell and "she" for Shell. She'll torch, but that's the only supernatural property Shell's bringing to the merger; she'll retain all Bell's magic. Shell looks a little older, but not much; they'll go with that, as they think torching probably conflicts with actually aging and they don't think twenty is the ideal place to sit forever and whatever Shell is supposed to be is closer. They are omitting the nightmares, good riddance.
"Last minute questions, comments, reasons to expect this to be a bad idea in some way?" Bell asks.
Shell shakes her head. She is looking forward to not being a separate person anymore.
"You're not even boosted for that, are you," murmurs Shell Bell wonderingly. "I wonder if even Eights could do that."
"I'm not," Shell Bell says consideringly, "sure how she'll react to our disassembling Downside. I don't mind disappointing the torturers, but she was nice to me."
"Yes. She did. But I wish I'd waited longer to find a contractor. A torturer who likes to keep long term pets got me before my grace period was even up and someone who only wanted to hurt me for nine hours would've been a better rescuer than none at all."
"I was assigned to Chainsaw. I don't think, by reputation, he'd have been inclined to keep me as a pet for - I haven't counted it up exactly and I didn't have enough access to timepieces to know for sure even if I did count days, but I'm pretty sure it was on the order of twenty-five years. Undoubtedly it would have been horrible, but I still had most of my memories after the first time Voice tortured me, even the second and third and fourth, it took a long time for me to get as wrecked as I did. I wouldn't have thought of it as being better. But it might've been."
"That reminds me," says Shell Bell, making eye contact with Golden. "I think you probably understand this more than any of the others do - but you need Edward and it's not just because of the mate bond. I'm sure turning hurt more than anything Voice did to me. I only had a human body to feel it with. But I was all by myself except for Voice. It made a difference."
"Understood," murmurs Golden. "I'm not planning to attempt to do without him. Ever."
He's feeling... well, if they're done talking business for now, he would really like Nathan to take him somewhere quiet and throw him up against a wall.
He slips out of the room, to no objection from either Bell.
He takes the Joker back to their lovely soundproofed room.
And pins him up against a wall.
It doesn't take long for him to come up with enough hexes to get his regeneration back up to pre-mortem levels, and then he adds flavour-tuning on top of that. Giving Nathan a nice tummyache seems like the perfect way to finish up.
Ooh yes. Don't think he didn't notice Nathan being all serene about the Joker whoring out his mint powers like that. He loved jealous Nathan, but he loves okay-with-it Nathan too, he really really does.
Not in the tummy region, though, that's fit to burst at the moment. He stops drinking. Eventually.
His immunity to venom, slipped in with one of those regeneration wishes, means he feels quite safe kissing Nathan very very thoroughly.