2girls, ass-to-ass, assisted_stretching, bare_arms, bare_legs, bikini, black_hair, blue_bikini, blue_buruma, blue_sports_bra, blush, brown_eyes, buruma, closed_mouth, looking_at_viewer, matsunaga_kouyou, multiple_girls, navel, open_mouth, original, ponytail, red_bikini, red_buruma, red_sports_bra, smile, sports_bikini, sports_bra, stomach, swimsuit, thighs, two-tone_sports_bra