Arm Wrestling

Iwaizumi becomes insecure about his body after losing an arm wrestling contest with Ushijima and overworks himself. Can Oikawa help him before it's too late?
Warning: includes language. Disclaimer: all the characters except two unnamed men in chapters 5 and 6 do not belong to me. All other characters are the property of Haruichi Furudate. I do not own any of the art either. Full credit goes to the creators.