"There's 'drastic change' and then..." Sam shrugs, letting his arm drop to Castiel's waist. "It's a lot to get used to. But I want you to know that if you need anything or need to ask questions, don't be afraid to ask. If not me, then at least Ellen." Ellen being an Omega might mean she was easier for Castiel to talk to. Then again, maybe not as he probably hadn't been around many Omegas in his life. "You are welcome and wanted here, Castiel. Just so that's clear."