Not wanting to risk any confrontation with the cops, you open your window and exit. You land on the railing and begin climbing the ladders down to the street level. Unfortunately, now you are out in the open streets, with cops following you. You spot an opened door and begin running to it. The building looks abandoned so you should be safe here.
You enter it and find it to be a storeroom of sorts, there are boxes around the place. You move forward and examine the boxes, seems to contain some sort of alcohol. You then hear movement in the back of the room, looking forward, you see an Irishman carrying a barrel of ale. His hair is short and contained in a cap, you spot his thick orange beard. A scar runs across his head. He stares at you "Who're you, and how'd you find this place." You move closer to the door and say you just found the door was opened. He shrugs "Bah, doesn't matter. I've done my job and most of the cities Irish, Guess I'll continue it." He knows something about people becoming Irish? You ask him what he means, and he grins proudly.
"Us Irish folk had our pubs around the city, we 'convinced' the other pub owners to join our plans. On St. Patricks day we would strike, we had a special brew blessed by a magical short fella. It'd help spread the festivities, those who drink it become tough, rough, Irish men. It also makes you more youthful, stops your aging, and helps with your libido." He begins laughing, then rushes to you. You open the door and go to leave but he grabs the back of your shirt and pulls you into the room. "Whoever drinks it also has their seed changed, our cum gets the same properties as this beer."
You get off the floor and run, finding a door at the back of the storeroom you continue your sprint. Behind you, you hear the mans footsteps. You open door after door, with no real aim in mind besides just getting away. Eventually, you open a door, only to be pined by a man who you didn't see. He holds you close with one arm, the other bringing beer towards you. You struggle and resist, but eventually, he wins and you drink. The transformation is instant, you don't know if it's because of a special brew or some other factor, in fact, you have no time to think.
In a second, your appearance shifts, you look just like the barkeeper who told you everything.
You discovered the truth, but you were caught and transformed in the process. Now you are the barkeeper Finn, you regularly meet with your other barkeepers, and ensure that your pub is full of your strong, Irish brew.