Blushing Mannequin!Mannequin-san, Sekimen Chuu!; Yüzü kızaran manken; マネキンさん、赤面中！; 人体模型在脸红; 人體模型在臉紅

A boy is forced to dress as a girl to be a Mannequin for his sister/brothers fashion designs, its a trap one shot from oto nyan