Cas didn't see why - his clothing covered his vessel and served its purpose, but he couldn't think much further beyond that. His head thudded backwards against the wall, an uncommon feeling shooting through him in the form of a shiver. He hadn't been aware such a thing could happen just from her mouth on his throat.
He gasped, pressing back further into the wall. He couldn't decide if he wanted to lean into it or to push away. It was a strange trade off, but he tugged the fabric on her body down further so the negligee was caught around her middle, one large hand smoothing over the skin of her chest while the other tangled in her hair.
"I-Is this...is this how it's meant to go?" he asked.