you were minding your own business until you found a green treasure chest in your room. You clearly don't remember seeing this before before so you approach it cautiously. You step back as it started moving and it opened revealing fangs around the rim, then a pink humanoid shortstack rises. You can see she's part of the chest

Hi Ho! You have found me brave traveler! I am Pink Mim, the greatest mimic ever~! she strikes a pose which was supposed to be awe inspiring but it's more cute and lewd