Having snagged a towel from a hanger, Marcus had dried her off as best he could before moving her to the bed. Then he dried himself off, stripping off his wet clothes and putting on clean pajamas.  He would've done the same for her but she looked so exhausted he didn't want to jostle her.  So instead, he climbed under to covers beside her and slipped his arms around her again.
There was no way he was going to sleep, he knew that.  Not with her fragile like this and the realization of just how strongly he cared for her causing his heart to pound in his chest.  But he was fine with that, he just needed her to be okay and he was dead set on seeing her through this.