niss oekaki, kei (blue archive), blue archive, highres, textless version, 1boy, 1girl, all fours, bare legs, belt, black belt, black hair, black hairband, black necktie, black pants, black skirt, black socks, blush, clothed sex, collared shirt, couch, covering another's mouth, doggystyle, ear blush, from side, game development department (blue archive), hairband, half-closed eyes, halo, hetero, indoors, jacket, loli, long hair, long sleeves, necktie, necktie in pocket, on couch, open door, panties, panties around leg, panties around one ankle, pants, pink eyes, pink halo, rectangular halo, red halo, sex, sex from behind, shirt, shirt pocket, side ponytail, skirt, socks, solo focus, sweat, thighs, trembling, underwear, very long hair, white jacket, white panties, white shirt