On my birthday I answer the door to find a beautiful young nurse with whom I have enjoyed email dialogue about buttock injections. She says she has come to give me a birthday present and I invite her in.
She sits down and tells me to drop my trousers as she takes a huge syringe out of her bag, making me fearfully but excitedly realise what her birthday present is. I nervously unfasten my trousers and let them drop as she begins to prepare the large injection, saying that it is her birthday as well and my present to her will be taking what she intends to give me because giving painful injections in the bottom is the part of her job she likes most. When my trousers are down she pulls my pants all the way down too and smiles at my frontal nude before continuing to prepare the injection with me watching. I apprehensively ask if it will hurt and she replies, "Of course. It wouldn't be fun if it didn't," and asks if I am scared. I admit that I am, provoking from her a smiling, "good!" Then she tells me to bend over her lap and I stretch my nakedness across her mini-skirted bare thighs. I tense on feeling the alcohol swab, making her giggle with satisfaction. The initial jab doesn't hurt too much but the ensuing injection really does. When the needle comes out I try to stand but she holds me in place saying that she has injected only a small part of the shot and will give me the rest in increasingly large doses. I then feel several shots in each cheek, every one hurting more than the ones before until the pain makes me shout to her delight as she continues the treatment. After a seeming eternity she lets me up and sensuously massages my tender posterior in rhythm to her singing "Happy Birthday to Us". She unabashedly enjoyed painfully injecting my vulnerable bare bottom and I found the treatment terrifyingly thrilling, so it has been a happy birthday for us both.