He leans in and kisses Athelstan. More accurately, he pours himself over Athelstan. Athelstan is now a vessel containing Ragnar Lothbrok (The!). Ragnar’s arms wrap around him, Ragnar’s weight pushes Athelstan back, taking no account of the precarious nature of bar stools.
Athelstan doesn’t understand how his world is now somewhere he can glide his hand down Ragnar’s spine. He dares to slip his hand under Ragnar’s top. He doesn’t dare move further down.