PS: These events take place in X791, after the timeskip and the grand magic games, after Lucy turned 18. What I want to say is, don't involve Wendy in any 18+ activities, those chapters will be deleted. With that out of the way, let's go! And I am going to use present tense in this storyline, let's see how that goes :D
You are lying down on your roof looking up at the clouds, listening to some nostalic songs from your school days. It isn't raining yet, but the sun is hidden behind the dark clouds. You take a deep breath, reminiscing about your past. Those were the fun days, no work, no pressure, only anime and some studying here and there. You wish you could go back to that time. But alas, time is irreversible, at least with our current technology. You have ended up becoming what you never wanted to become, just another brick in the wall. You sigh, watching the clouds always reminds you of a certain lazy genius. And it always leads to thoughts about one Anime or the other. You still remember when you used to wish that you would be teleported to another world some day. You were so naive back then.
You check your phone, it is almost time. You have to go back to your work. You don't really hate your work, but it would be an exaggeration to say you enjoy it. But it pays well enough, and that's all you really need from it.
In some distant(if that's what we want to call it) universe, the anime world you were thinking about moments ago, is not just fiction. It is the reality! It is just another day in the fairy tail guild, or at least, it was, till Lucy decided to try something new. She has found a weird looking key, she thinks she can summon another spirit using it. The key reads "An obedient servant". Lucy is feeling excited. Some guild members caution her against using this key, it could be a trap. Nobody has heard of this key before. But Lucy insisted, she wants to try it and find out. Her curiosity can not be discouraged so easily. She has already deciphered the text on the back of this key, with help from Levy of course.
"Hirake! Dorei no Tobira! Homo Sapien!(Open! Door of slave! Human!", she puts her magic into the key and points it in the middle of everyone. A bright light engulfs the area.
In your universe, you see the same bright light. "What the hell!", you jump to your feet, startled by the event. But it was over in a flash. You stand dumbfounded as you see some rather familiar faces, but faces you can't believe. It is fairy tail!
You rub your eyes and pinch yourself, this has to be a dream. Oh God! Why couldn't this be real. But you don't wake up. You are still shocked from this event. You look around seeing everyone, the guild is a little startled too. They mumble among themselves, some shooting you disgusted looks. Lucy looks at you, inspecting you. You look like a normal human, but you must be a spirit just like Leo. She comes closer, you still can't believe this is happening. Even though you didn't wake up from the pinch, you are sure that this is a dream. You must have fallen asleep on the rooftop. You have to wake up before you get late to work, or wait a second! Work is clearly less important than this!
"Lucy!", you say excited. But before you can reach her, you feel a knee on your back. "Argh!",you wail falling down on the floor. Erza is pinning you down. It is only now that you realise you are butt naked! No wonder some of them are covering their mouths in disgust. Erza says something to Lucy while keeping you pinned down.
Note: Will be using Google translate for the Japanese that the character doesn't understand. Since it is your PoV, it's not necessary to understand the Japanese and I am writing this story with the expectation that nobody will Google translate or try to find exact meaning of the sentences. But you can google translate to get some idea if you really really want to know.