steins;gate, makise_kurisu, 1girl, anus, bangs, bed_sheet, blue_eyes, breasts, brown_hair, cellphone, censored, completely_nude, covering_mouth, female_masturbation, fingering, foreshortening, knees_up, long_hair, looking_at_viewer, lying, masturbation, medium_breasts, mosaic_censoring, nipples, nude, on_back, on_bed, one_eye_closed, phone, pussy, recording, smartphone, solo, spread_legs