"Yeah." He remembers the pleasure prison too; even if he never actually interacted with Spike there, Ianto told him all he needed to know. He nods in acceptance of the second part. He knows all too well that if any of them leave here without their memories of here, nothing that happened here will matter anyway.
And then he lifts his eyebrows, laughing at the sheer strangeness of that idea. "Unfortunately, I don't think that Torchwood has any information or knowledge at all about souls. Not to mention that in the time I'm from there is no Torchwood. All that's left is me, and a partially functioning wriststrap. No resources, no contacts, no nothing."
No wonder he's so not bothered about going back there.
He gives Spike a rueful little shrug. "Sorry. I wouldn't even know where to start looking after a soul."