Peter Parker:
He'd have his face buried in your hair, and you'd be on your sides.
Peter Quill:
He'd sleep on his stomach, his arm draped over you.
Daredevil:
Sleeping on your backs, you'd have your arms looped together.
Falcon:
He'd lay on his side, and you'd lay on your stomach. He'd have an arm on your back.
Young!Charles:
He'd have his arms wrapped around you, and his chin on your head. (This is with the serum)
Young!Erik:
He doesn't want you to leave him, so he'd have his arms around your waist and you'd have your back against his chest.
Ant Man:
He'd have his arm as your pillow, and your arm is draped over his chest.
Johnny Storm:
You both lay on your stomachs, and he has an arm on your back.
Cyclops:
He'd lay on his side, and you'd lay on your stomach. He'd have an arm as your pillow.