His hands are, indeed, large. All of him is large, really, so perhaps it's for the best that they're starting out with fingers first, because it's been a long while since Éomer has felt free enough to lie with a man, and when she gets herself off at night, she usually just rubs at her clitoris until she shakes through a silent orgasm and can fall asleep soon after. It's nice to feel the stretch again, and Eskel very kindly strokes at her clit while he presses his finger into her, so it doesn't take long for her to adjust as start to rock her hips gently to meet his hand.