You are a loved princess and it's your 20th birthday as a family tradition you should imprint a knight (not human) but you are against the knight system of Homunculus ,because humans treat them as slaves. Except for protection they are brainwashed to serve their master at night just like slaves ,you are so Popular between homunculus for being kind,he likes you and because of imprinting if he goes against your will he will feel pain,this is first night of imprinting and you two left alone...