Sam nodded. He wasn't entirely reassured, but at least that was out in the open. He wouldn't - hopefully - have to give Hermione that speech again. "I hope he does everything he can to make you happy, too," Sam said honestly. He was still getting to know his younger brother, but Sam wanted to think that he was a decent guy. He seemed like a decent enough guy. It was kind of weird when Sam knew more about Hermione Granger than he did his own sibling, wasn't it? Nonetheless, Adam was a lucky guy. Being able to date someone like Hermione Granger? It didn't happen often. She definitely was a catch, something that Sam fully intended to remind Adam of every chance he got.
Looking down awkwardly, Sam released a nervous, yet relieved sort of laugh. "So, uh, big brother speech. On a scale of one to ten, how'd I do?" He shot Hermione an amused look. "It was sort of my first one," he confessed. "...ever." Sam was no stranger to looking out for his brother before (he had Dean, didn't he?), but this felt different. Adam wasn't Dean. He wasn't the brother that Sam had spent his entire life looking up to and trying to be exactly like. Adam was...well. He was Adam. Younger, completely new to the environment Sam knew better than any other, and lacking entirely in the knowledge of the new world that he had been thrust into. Sam was going to have to make sure he knew how to take care of himself. He was going to have to teach him things. Offer his advice. Set an example. All of that would inevitably lead back to whether or not Adam got killed during this apocalypse; in Sam's eyes, he had a big responsibility thrown before him, something that he wasn't going to let go unattended to. Dad didn't seem to be stepping up to the plate and Dean was still getting used to the idea, so it really did seem like Sam was gonna have to take charge here with Adam for a while.
Poor kid.
"And there will be danger," Sam said sternly. "Always will. With us, it doesn't stop." He had learned that the hard way years ago, back in Stanford. "So I suggest you try and make sure that you're prepared for the worst. That's all I ask, okay?"