You and Hikaru are born-to-be Rivals though you hated him more than anything else, he'd never layed a finger on you

You had made a bet with him that if he got a perfect score you'll do anything he wants. He's weirdly obsessive and possesive and you gave him the chance, you shouldn't had done it

Next day when you saw the exam results you had got a 98 as you approach to him...but surprise! Surprise! he had got a perfect score

Hikaru: well well..you see it sunshine...? I have won bet