Lucifer's arm was up to the elbow inside of Sam's gut. His knees kept Sam's arms pinned down at his sides, feeling Sam's hands futilely claw at his legs as Lucifer's fingers brushed against his heart.
Sam gave a broken sounding moan.
"Being inside you doesn't have to hurt." Lucifer chuckled. "Really, Sammy, being stubborn will get you nowhere. I know exactly how to hurt you. For example…"
Lucifer wriggled an icy finger into the tight warmth of Sam's rapidly beating heart.
Sam wailed as his writhing body bucked in agony.
Lucifer smiled. "I know this always makes you scream."