1girl, alternate costume, black skirt, black thighhighs, blonde hair, blue eyes, bob cut, breasts, hand in own hair, hololive, hololive english, long sleeves, lying, medium breasts, medium hair, on back, partially submerged, red sweater, seistfu, skirt, solo, sweater, thighhighs, thighs, turtleneck, turtleneck sweater, upskirt, virtual youtuber, water, watson amelia