an AcceleRacers/harry potter crossover
the summer before lily started started seeing James she had a fling with shirako's dad when the summer was over and school started back she found out she was pregnant the only person she told was Snape who helped hide her growing belly and helped her contact shirako's dad so that he could raise him ."plot"
harry finds he has an older brother lily left a letter to be given to him when he starts hogwarts telling him about his brother and asking him to find him and also a letter was being sent to shirako and his dad...
harry/shirako-brothers both harry & shirako like cars & music
shirako-magic? maybe a squib
no pairing harry going to be younger than the AcceleRacers so they'll be more like big brother/sisters