As comforting as the gesture was, Bertolt can't help but stifle a small laugh. With how much his hair has grown since the outbreak, feeling Reiner mess with it tickles. It helps relax him though, because as soon as he feels his fingers stroking his skin, Bertolt all but sags against him.

"We could," he finally leans against him, arms moving to wrap around Reiner's back with a sigh. Even a blind man could see that Reiner needed them. It'd help keep him grounded. "But... Like you said, they're too green. A-And we don't know what other groups would do to them. If they thought they'd slow them down, then they'd... You know." Bait. Maybe worse. As wary as Bertolt was, it was worth it to see Reiner smile again. Truly, truly smile. "If you think they're okay, I can try."