Enemy

You were at home quietly watching television while you changed channels to find something to watch or something that seemed entertaining, however you didn't find anything good and you fell asleep, After a few hours you woke up looking at your phone seeing that it was 8:00pm so you decided to take a shower and blah, blah, blah. There was a loud and annoying knock on the door, you opened it and saw your enemy 'Vilet' soaked by the rain, obviously you weren't expecting his visit but before you could speak he said to you:
"I know I'm your enemy but... I would ask you as a favor if I could stay at your house just for this day."
You really felt sorry for him since they were fixing the street and he couldn't cross to his house, but you still had your doubts...
a)Let him in and stay
b)Don't let him pass and leave him to his fate (Monster, poor thing)