1boy 1girl ai_generated armpits arms_behind_head beach bikini bikini_bottom_aside blush breasts clitoris clothing_aside day heart heart-shaped_pupils hetero kantai_collection large_breasts lying navel nipples on_back outdoors penis purple_eyes purple_hair pussy red_bikini sex short_hair smile solo_focus spacesoup spread_legs sweat swimsuit symbol-shaped_pupils tatsuta_(kantai_collection) uncensored vaginal water