Even before Nadine had fully flexed

Even before Nadine had fully flexed her arms Jörgs jaw dropped and not just his, but also both of his parents. The idea, that the arms of his sister could have been muscular had never crossed Jörgs mind. Toned and athletic sure, between gymnastics, track, swimming and jujitsu barely a day passed that Nadine did not spent with some type of physical activity, but the way the tender skin now stretched across bulging muscles and sharp lines drew deep between the muscle groups he never would have thought possible. Her young biceps rose steeply into an iron like peak, while at the same time defined triceps formed a thick sweep below and the rippling muscles pushed out in her shoulders. The skin looked like it was about to tear, everywhere the bulges of muscle and cable like sinew showed. As if the powerful upper arms were not enough Jörg could also see clearly how pronounced her pecs were, at the very last from where they met the shoulders to the point where they disappeared beneath the purple fabric of the top, and how impressively wide the sweep of her lats spread behind her at least for a girl as slender as his sister.