She pretends she doesn't notice.
Her fingers glide down his bare arm, which is long and smooth, until they reach his palm. Big, she thinks. Strong. Her fingers lace around his, and she squeezes him, trying to capture his strength, his ability to detach. Her other hand goes to cover her mouth because she doesn't want to let out any embarrassing sounds.
She finds him squeezing her smaller hand in return, and they lay like that, until Ellie drifts off to sleep.