Against numerous advice! Okay, not necessarily numerous, but some. Jim doesn't care, he's never had reason not to trust him.

"Really? And here I thought you'd been raised by angels and nuns," he says dryly, raising an eyebrow. "Alright, I'll show up sometime. I'll let you know beforehand, just in case you're not there."

Honestly it is pretty great if Loki really does manage to heal him.