My little sister took my virginity last weekend

The other night when our parents were gone for the weekend, my sister came into my room at night and asked if she could sleep in my room because her heater was broken. I said sure and went to get the spare mattress. When I came back, she was in my double bed. "Can't I just sleep with you in your bed?", she asked innocently. "Uh...sure" I said, I thought it wouldn't be a problem (I'm 16 and she's 14)
I climbed in, and we lay down facing sideways in opposite directions, turned off the light, and started falling asleep. Just as I was losing consciousness, I feel my sister moving next to me. She's writhing slightly, rhythmically. She starts breathing a little heavy. Oh my god, is she... I turn over to face her, eyes closed, pretending to be asleep. She quickly turns over to face the wall. Yeah, she was definitely masturbating. After a few minutes lying motionless, her back towards me, she starts writhing again. My cock starts getting hard, and her shifting ass starts to bump against it. She slows down momentarily, realising what is happening. But then she speeds up, grinding more and more against my cock, breathing heavily. After awhile, she reaches behind and grabs my arm, pulling it to her body, up her top to her little breasts, brushing my fingers against her hard nipples. I start caressing them, grabbing them. She's breathing heavily, and little soft moans escape. She grabs my hand again and drags it back down her body, lower, until it reaches her underwear. She slides my fingers inside,through a soft little mound of hair.... Oh my god, I had never touched a pussy before, and this was my sister's. She rubbed my fingers over her clit. I started rubbing her by myself, feeling her wetness. She pulled her hand free as I rubbed and reached behind her to feel my cock. Her hand felt it through my boxers, and I pulled them down with my other hand so she could touch. She slid her petite little hands over it, and I was so hard, more hard than I had ever been. She started stroking it, pulling the skin down, pushing back up again, her fingers sticky with my precum. I slid a finger, two fingers, into her vagina. They could hardly fit, but I plunged them in deep, and she let out a huge gasp. I worried I was hurting her. I pulled out quickly, but with her other hand she grabbed mine and pushed it back in again, and I got the idea. As she pumped my cock faster I fingered her faster and deeper, and our bodies writhed together. I slid my other hand underneath her and grabbed her breast, playing with her erect nipple. She pulled her panties down and pulled my penis toward her pussy. I pulled my fingers out as she slowly pushed my penis in. She gasped, a girly high-pitched gasp, struggled to get me in. It felt so warm and wet, I had never felt anything like it. Slowly I started fucking her, pushing deeper into her vagina with every thrust while I rubbed her clit. She let out loud, high-pitched gasps as I fucked her hard form behind, panting against her shoulder, our bodies rhythmically convulsing. And then she screamed, and I came, shooting wave after of semen deep into my little sister's vagina, filling it's tight space while she shook with orgasm. Gasping and sweaty, our orgasms subsided and I slowly pulled out of her. After a few minutes, she turned to me for the first time that night and whispered "thankyou", kissing me on the cheek. "Goodnight", she said, turning back over.
I woke up in the morning to find her gone. Did I dream this? I smelt the bed - it smelt of semen and my sister. On the floor were my sister's clothes. I walked to the kitchen and she was, completely naked, her little ass facing towards me while she made breakfast. She turned around and said "Good morning!" in a perky voice. "morning" I replied, stunned. "I don't think we should mention last night to anyone, do you?" she said, walking towards me. "I just thought it felt right that my big brother should take my virginity. How was I? Was I better than any other girl you've had sex with? "Uh...I was a virgin too", I said. "Oh! You seemed like you had experience. Maybe it's all the porn you watch, I've peeked in on you masturbating before". I look down, embarrassed. "But you made me feel sooo good", she said, reaching up on her tiptoes and kissing me on the cheek. I was hard again, and she felt it press against her belly. Smiling at me, she got down on her knees and pulling down my boxers, exposing my erect penis. She looked up at me with innocent eyes. "Here, let me help you, I want to make you feel good. That's what sisters are for..."