oyama mahiro and oyama mihari (onii-chan wa oshimai!) drawn by tamayan

2girls ahoge animal_ears arms_up black_hair cat_ears cat_tail double_v jumping lab_coat long_hair long_sleeves looking_at_viewer male-female_symbol multiple_girls neck_ribbon one_eye_closed onii-chan_wa_oshimai! open_mouth orange_eyes oyama_mahiro oyama_mihari pink_hair pleated_skirt ribbon school_uniform shoes siblings sisters skirt socks suspender_skirt suspenders tail tamayan twitter_username uwabaki v yotsuba_university_affiliated_junior_high_school_uniform