Couldn't fall asleep and started thinking about stuff, this is what happened. Sorry for any mistakes, hope you enjoy :)
Disclaimer: I don't own anything, blah blah. Just my twisted obsessive imagination xD
Sirius Black loved Hogwarts, simply because he got to get away from his family and be with his best friends. But some of the classes were spoiling his happiness, like Potions where he and Remus were forced to sit in the third row while James and Peter sat in the back. Their separation was caused by an accident the four of them had caused during their very first class in the first year and so the professor decided being apart would help the boys to behave and his classroom to stay in a useable state. Still, it had been worth it. Besides now they were supposed to be mixing a love potion which girls were thrilled about and boys not so much. He let Remus do most of the work, occasionally pretending to help when the professor was passing by.
The class was supposed to be let out in a little over ten minutes and Sirius breathed out. Finally they'd get away from the stinking Dungeons and go for his favorite Transfiguration. A pat on his shoulder and James saying "Hey Sirius" made him look away from a spider web he's been examining for a while. His best friend stood above him with a wide grin and when he wanted to speak back, a potion was splashed into his open mouth. He quickly slapped the flask aside to shatter on the floor and stood up to glare into Potter's face. "What the hell, James?!" he shouted, now having everyone's attention. Sirius rubbed his forehead and stumbled from behind their desk, his head all dizzy as he swayed towards the professor's desk. He didn't get that far though and stopped by the first row.
Everyone was watching him carefully and some amusedly, except for Severus Snape in the first row who never paid much mind to what the rest of the class was doing and just worked on his potion. When complete silence fell on the classroom though, he put everything down and looked away from his bubbling cauldron. Black was looming over him with dazed eyes and a shiver ran down Severus' spine. He was grabbed by his shirt and pulled from his seat. Before a single squeak slipped his lips, they were claimed by the tall Gryffindor. His charcoal eyes widened and stared at Black's pretty face. Yes, pretty, Sirius' personality was awful but his looks were magnificent. This was very much like a dream come true for Severus.
Someone snickered in the classroom and that sound brought Snape back into reality where Sirius has drank a love potion and was acting upon it. This was too cruel a joke, even for his hated Gryffindor foes. He pushed the other boy away, Sirius stumbled across the alley and landed on his backside by the desks on the other side of it. His eyes were still a little out of place when he looked at the Slytherin boy. Severus turned around briskly, gathered his bag and potions textbook and stalked out of the Dungeons, followed by rising laughter. He kept his head down to cover his tear-filled eyes with his greasy black hair all the way to his bedroom in the Slytherin dormitory. There he broke down and cried. He knew very well what Black and his friends, what probably everyone at Hogwarts, thought of him but because he didn't show his feelings didn't mean he didn't have any. And what the other boy had done hurt way more than being physically bullied.
What he didn't know was that James Potter, much like his son years later, was a failure at brewing potions. The love potion never worked.