1girl, 1boy, echidna (re:zero), re:zero, hetero, solo focus, long hair, white hair, purple eyes, bangs, hair between eyes, colored eyelashes, blush, open mouth, looking at viewer, looking back, from behind, black dress, vertical-striped dress, striped, vertical stripes, capelet, black capelet, hair ornament, butterfly hair ornament, outdoors, sex, vaginal, doggystyle, sex from behind, clothed sex, penis, pussy, ass, anus, pov, ass focus, uncensored