I wanted to surprise my boyfriend for his birthday. I didn't have time to get him a classic present so I came up with another idea. I know that he's into black lingerie and harness so I bought one to surprise him. I wait for him to wake up and tell him to stay there for a couple of minutes until I change into something more comfortable. He has no idea that I'm going to wear something so slutty. I go back into his room, wearing black lingerie and a black harness with his favorite pair of high heels. The harness makes my ass look amazing, it's so round and he gets an instant boner.