As I walked into the living room, I could see Buffy and Spike sitting on the couch, a large wrapped present on the table in front of them. They both looked up at me and smiled.

“Happy birthday, Dawn!” Buffy said, her voice filled with excitement.

“Thanks!” I replied, feeling a little nervous. I had no idea what they had gotten me.

Spike stood up and walked over to me, holding out his hand. “Come on, let’s open your present.”

I walked over to the table and started tearing off the wrapping paper. Inside was a wooden box with a hinged lid. I opened it up and peered inside. There was nothing in it.

“What is it?” I asked, confused.

Buffy smiled at me. “It’s a gift certificate, of sorts. Spike and I have decided to give you a very special birthday present.”

I raised an eyebrow. “What kind of present?”

Buffy grinned. “You get to have sex with Spike whenever and however you want.”

My jaw dropped. “What? You’re joking, right?”

Spike stepped forward. “Nope, we’re serious. It’s your eighteenth birthday, Dawn. You’re an adult now. And we want to give you something special.”

I felt my face turning red. “I…I don’t know what to say.”

Buffy walked over to me and put her arm around my shoulders. “There’s no pressure, Dawn. If you don’t want to do it, that’s fine. But we just wanted to give you the option.”

I looked up at Spike. He was watching me intently, his blue eyes sparkling. I had always found him attractive, even though he was a vampire. I had even had a crush on him when I was younger.

But this was different. Having sex with someone was a big deal. And having sex with Buffy’s boyfriend? That was just…weird.

I shook my head. “I don’t know. I need some time to think about it.”

Buffy nodded. “Of course, Dawn. We understand. You can take as much time as you need.”

I wandered back to my room, feeling overwhelmed. What had just happened? Was Spike really willing to have sex with me? And why would Buffy be okay with it?

I spent the next week trying not to think about it. But it was always in the back of my mind, nagging at me. I couldn’t decide if it was something I wanted or not.

Finally, on a quiet evening when Buffy was out patrolling, I mustered up the courage to talk to Spike. He was sitting on the couch, flipping through a magazine.

“Hey, Spike,” I said, my voice barely above a whisper.

He looked up. “Hey, Dawn. What’s up?”

“I…I was just wondering if we could talk about…you know.”

Spike set the magazine aside and patted the seat next to him. “Sure. What do you want to know?”

I sat down and took a deep breath. “Are you really willing to have sex with me?”

Spike grinned. “Absolutely. But only if you want to.”

I looked down at my feet. “I don’t know if I do. I mean, it’s just…kind of weird, isn’t it?”

Spike shrugged. “I guess it depends on how you look at it. But if you’re not comfortable with it, that’s fine. We don’t want you to do anything you’re not ready for.”

I was silent for a moment, thinking. Finally, I said, “What if…what if I just try it? Just once. Just to see how it feels.”

Spike nodded. “We can do that. Whenever you’re ready.”

I took another deep breath and looked at him. “Okay. Let’s do it.”

Spike’s face lit up, and he leaned over to give me a quick kiss on the cheek. “Alright. Whenever you want, just let me know.”

Over the next few days, I tried to ignore the fact that I had agreed to have sex with Buffy’s boyfriend. But every time I saw Spike, I felt a twinge of excitement. What would it be like to be with him? Would it be as good as I imagined?

Finally, one night, I decided to go for it. I slipped out of my room and tiptoed into Spike’s, where he was lying on the bed, watching TV.

“Hey,” I whispered, the sound barely audible.

Spike sat up and grinned. “Hey, sweetie. You ready?”

I nodded, feeling my heart racing. Spike patted the space next to him, inviting me to sit down. I took a deep breath and climbed onto the bed, lying down next to him.

He put his arm around me and kissed me gently on the lips. I felt a jolt of electricity run through my body, and I kissed him back hungrily.

Spike’s hands began to wander over my body, his touch sending shivers down my spine. I moaned softly as he moved his lips down to my neck, nibbling and sucking on the skin there.

Before I knew it, I was naked, my body pressed up against his. Spike’s cock was hard against my thigh, and I felt a rush of excitement at the thought of having it inside me.

“Spike,” I whispered, my voice rough with desire.

He looked into my eyes and grinned. “You ready for this, pet?”

I nodded, my breath coming faster and faster. Spike moved his hand between my legs, stroking my clit gently. I gasped at the sensation, arching my back and moaning loudly.

Finally, Spike slid inside me, his cock filling me up completely. I cried out as he began to move, his thrusts slow and deep. He kissed me passionately as he fucked me, his hands gripping my hips tightly.

I wrapped my legs around him, pulling him in deeper. The pleasure was so intense, I thought I might explode. Spike’s cock was like nothing I had ever felt before, big and hard and perfect.

We fucked for what felt like hours, each thrust sending me higher and higher. Finally, I felt myself begin to come, my whole body shaking with the force of it. Spike came a moment later, his body spasming as he filled me up with his seed.

We lay there for a few moments, panting and sweating. Then Spike kissed me gently on the forehead and got up to put some clothes on.

“Well, that was fun,” he said, grinning at me.

I sat up, feeling a little dazed. “Yeah. Yeah, it was.”

Spike walked over to me and put his arm around me, pulling me into his embrace. “You know, Dawn, we can do this again if you want. Whenever you’re ready.”

I looked up at him, still trying to process what had just happened. “I…I don’t know if I want to do it again. But…maybe. Someday.”

Spike nodded, his eyes kind and understanding. “Whenever you want, pet. Whenever you want.”

The few days since my first time with Spike had been a blur. I couldn’t stop thinking about it, replaying the memory over and over in my mind. It was like a drug, I needed more of it.

One evening, while Buffy was out on a training session with the potentials, I found myself alone in the house with Spike, once again. I had been thinking about him all day, and I couldn’t resist the temptation any longer.

“Spike,” I said, my voice low and seductive.

He looked up at me, a smirk on his face. “What’s up, pet?”

“I want to do it again,” I whispered.

Spike’s face lit up with excitement. “Are you sure? You know you don’t have to-”

I cut him off with a kiss. “I’m sure,” I murmured against his lips.

Without another word, Spike tackled me to the ground, his strong arms pinning me down. He kissed me hard, his tongue probing my mouth as his hands roamed over my body.

I moaned into his mouth as he slipped his hand between my legs, teasing my clit with his fingers. I was already wet, ready for him.

Finally, Spike climbed on top of me, lining up his cock with my entrance. He pushed inside me, filling me up completely. I cried out at the sensation, wrapping my legs around him and pulling him in deeper.

Spike didn’t hold back, fucking me hard and fast. I was lost in the pleasure, the sensations of his body against mine. I clung to him desperately, wanting him to never stop.

I could feel myself building towards orgasm, the intensity growing with every thrust. And then, suddenly, Spike pulled out of me and wrenched my head backwards by my hair.

“Open your mouth,” he growled.

I obeyed, gasping at the sudden change. And then he was coming, hot and sticky, all over my face. I moaned as I felt his warm cum dripping down my cheeks, my tongue darting out to taste it.

Afterwards, he leaned down and kissed me gently on the forehead. “Good girl,” he murmured.

(Continue the story. Dawn asks for another round, this time she wants Spike to fuck her ass).