yukia (firstaid0), julia (fire emblem), seliph (fire emblem), fire emblem, fire emblem: genealogy of the holy war, nintendo, highres, 1boy, 1girl, alternate costume, bikini, blue bikini, blue eyes, blue hair, breasts, brother and sister, circlet, cleavage, height difference, holding, holding hands, holding swim ring, innertube, large breasts, long hair, looking at another, male focus, outdoors, ponytail, purple hair, siblings, swim ring, swimming, swimsuit