One mistake after another.

17 year old Eren has the lowest chance of graduating. He's been held back, and probably will have to retake 12th grade. 21 year old Levi, on the other hand, graduated with honors. The two have just met, (while under the influence) and totally hit it off. But watch out! Pain, hatred, and despair are soon to follow! Roughly based off of a loving mistake by Volume_Struck