1boy, 1girl, blue_theme, blush, breasts, cleavage, closed_mouth, comic, fate/grand_order, fate_(series), fujimaru_ritsuka_(male), glasses, indoors, koyuki_(kotatsu358), large_breasts, mash_kyrielight, monochrome, one-piece_swimsuit, open_mouth, school, school_swimsuit, school_uniform, short_hair, speech_bubble, swimsuit, swimsuit_under_clothes, teeth, undressing