1girl, i, arms_under_breasts, bed_sheet, black_bra, black_sweater, blush, bra, breasts, brown_hair, crossed_arms, double_bun, earrings, gameso, hair_bun, heart, heart_earrings, idolmaster, idolmaster_shiny_colors, jewelry, large_breasts, looking_at_viewer, lying, navel, on_back, pout, ribbed_sweater, sleeveless, sleeveless_turtleneck, solo, sonoda_chiyoko, sweater, turtleneck, twintails, underwear, upper_body, v-shaped_eyebrows