The Unseen Desire.
Read the storyAt a reunion party with many boys and girls at the age of 23 drinking and dancing. Amongst them, invisible to their eyes, a sex genie roams the party over hearing people wishing for things, but not in a literal way, unfortunate for them, the sex genie will Grant them the spoken wish to the wishers horror. She have a long list of different modifications she does on peoples bodies, and she gets exited when she see the wisher panic and struggle with their modified part/parts.