Rule 34 Dev - 1boy 2girls arms_up asahina_nazuna back bare_shoulders barefoot bikini blush breasts happy highres large_breasts long_hair monochrome multiple_girls nagumo_miyabi novel_illustration official_art open_mouth shorts smile splashing standing standing_on_one_leg stomach sun sun_glare swimsuit thick_thighs thighs tomose_shunsaku topless_male water wet wide_hips|21689530902