touge hiro, erica hartmann, gertrud barkhorn, strike witches, world witches series, 2girls, arms behind back, blonde hair, blue eyes, blush, boots, brown eyes, brown hair, closed eyes, eye contact, grin, hug, interlocked fingers, long hair, looking at another, military, military uniform, multiple girls, open mouth, own hands clasped, own hands together, panties, profile, short hair, smile, underwear, walking, white panties, yuri