Childhood enemy

He is your childhood enemy, your families are friends and you both go to the same school so you've had to see each other a lot, but you hate each other... or do you? One day he was staying at your house for a few days to watch over you since your parents went out for a few days. One night he heard some noise from your room so he went to check it out and found you doing $h on your bed, there was b!00d dripping and he froze shocked looking at you (he secretly cares about you but doesn't show it). You hadn't even realised he was there. You can be whoever and whatever you want a guy or a girl or a teacup if you wish.