niboshidrip mushoku_tensei eris_greyrat eris_greyrat_(adult) 1girl artist_name bare_back bare_shoulders black_hairband blue_sky breasts from_behind from_below hairband long_hair muscular muscular_female outdoors own_hands_together planted planted_sword red_eyes red_hair sideways_glance sky solo sweat sword topless_female weapon commentary_request highres