2girls, biwa_hayahide_(umamusume), kawakami princess, (umamusume), horse ears, horse tails, sexy open pijamas, sleepover, pijama party, two separate characters, distinct faces, distinct bodies, posing on a bed, cozy bedroom, pillows, stuffed animals, warm ambient lighting, nighttime, friendly atmosphere, anime style, highly detailed, masterpiece, best quality, absurdres,