Your parents forced you to join a special class in school, where you take care of an imp for the entire school year. It's supposed to get you used to dealing with children so if you have children later, you'll know how to take care of them. On the first day of the class all of you are introduced to the imps that you will be taking care of. While they insist it's just a group of imps that they found in the forest nearby, one of them in particular seems . . . she looks just like the other imps, but something about her just makes the hairs on the back of your neck stand up. Naturally she ends up being the imp you're going to be in charge of taking care of. It's only when you and her leave the classroom that she removes the facade, and you realize she's an arch imp.
What Do You Do?
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I just look at her and shrug, asking "Why did you hide your true form in the first place?"
"I wanted to surprise you, Big Bro. Also, I don't think they would've accepted me if they new I was an arch imp." She says smirking slyly.
She then grabs one of my hands with both of hers, and begins leading me down the school hallways, saying she wants to show me something. Strangely, I feel compelled to follow her, and we eventually stop infront of one of the locker rooms.
I then look up towards the sign as she drags me inside, it's the girls' locker room. This snaps me back to my senses a bit and I resist saying "I can't go in there. That's the girls' locker room." She gives me a pleading look and again I'm compelled to do as she asks.
Once inside, she locks the door behind us, not that anyone would come in since school is over, but it's nice to know she's taking precautions. She then pushes me against a locker and begins to make out with me, raising a knee up and leaning it against the locker, her arms on either side of me.
Meanwhile, I'm in shock, not only due to the sudden make out session, but by how dominant my little friend is acting. Still I can't bring myself to go against her wishes, and I return her kiss, wrapping my arms around her to bring her closer.
She eventually breaks the kiss, a single string of saliva connecting our lips. "Oh, Big Bro, I'm so happy. I knew the moment I saw you, I loved you and that I had to have you." After saying this she presses her head against my chest, with it being the only place her head can reach now that she isn't standing on the tips of her toes.
I struggle internally with the emotions this confession has brought on. A blush is brought to my face as I think things over and upon reaching a decision, think to myself "Screw it." and then, still with my arms wrapped around her, bring one of my hands down and lift up her skirt to grab her tight, yet surpirsingly well developed derriere, just above her black thigh high socks, and... wait a minute... she's wearing lacey black panties
She lets out a "Oh...!" in response then leers up at me lustfully. "Big Brother, I didn't know you were so naughty. But I'm happy you feel the same about your little sister." She giggles and then takes her arm and wraps them both around behind my neck, then she leads me to one of the benches in the locker room and then while locking lips with me, uses me to gently lower herself onto her back on the bench.
She breaks the kiss and starts to undo the neckerchief of her uniform and then opens up her top, then undoes her lacey bra so that her small, yet perky breasts are exposed. Meanwhile, I'm in the middle of disrobing my uniform as well, but stop upon catching a glimpse at the sight. She giggles noticing my gaze and a swelling down below, she then brings a finger up to her lips and asks "Like what you see?"
I snap out of it and once I'm completely in the buff, I descend upon her and penetrate her. Suddenly she cries out sharply and looking down I notice blood. I look towards her face and she's looking away, blushing. I grin and peck her cheek saying "Don't worry it's my first time too. I'll try to be gentle." and I continue my gentle loving. This gives her the encouragement she needed, apparently, and in no time is getting really into it, moaning loadly with the occassional words of adoration.
We continue like this for a while, until I start to feel a tightening in my gut, I try to hold back the inevitable, when she suddenly cries out "Big Bro! I'm-I'm-I'm-!" All of the sudden she lifts her head up and locks lips with me, her insides start to contract around my member, pushing me over the edge as well. We ride out our simultaneous orgasms together like this for a while, before it eventually dies down. We lie together for a little bit before finally gathering the strength to get up and get dressed. After getting dressed, and my new little sister/lover getting cleaned up in the locker room's showers, with me sneaking the occassional peek, we unlock the door and leave hoping no one stuck around after school and heard our little tryst.
After exiting the school I offer my new lover a hand and say "Want me to walk you home?"
She takes my hand and says "Do you even have to ask at this point?" and gives me a chaste kiss on the cheek and mutters "I love you."
"I love you too." I say in response, kissing her forehead and we continue to my home where I continue to look after my "Little Sister" for the rest of the school year.
Throughout the school year we almost got into a lot of trouble multiple times due to her lustful and selfish nature, with her almost forcing me to have sex with her during school hours, but other than that most days went as business as usual. After the school year had ended I continued to look after her, and we were even able to convince the principle to allow her to take classes with me, guess that arch imp charm spell has its uses, and there is rarely ever a time when we are apart for more than a few minutes. Needless to say, we could not be any happier, and I hope we stay like this forever.