It is easy to enter him, as Ragnar's finger earlier has made Athelstan slick and open; it comes natural to spread him wide and slide inside and be sheathed in the familiar, beloved body.

They fit perfectly, this way. Ragnar arches above Athelstan, just the right size to cover him and kiss his lips while inside him.

"You're exactly the right size," he murmurs against Athelstan's lips.