You're Kaworu.

Shinji was sleeping in his bed as usual, he liked to sleep to forget about problems and loose a bit.

Kaworu lately had problem with sleeping and he knew that Shinji had weird effect on him that made him sleepy and calm.

So you sneaked in Shinji's room and laid next to him wrapping your cold arms around him a bit.

"Kaworu? What are you doing?..." Shinji said half asleep now as he rubbed his eyes to get more awake and he yawned.