The Vampire Prince by Lissie (best ereader under 100 .TXT) 📕

Since they were twelve, twin girls have been watched by a stranger on their street. As they grow up, he doesn't change at all. He has black eyes and he never moves. He watches the delicate twin more closely than the strong one and returns every year on their birthday to look at them again. Their brother doesn't know, their unforgiving parents don't know, nobody knows about him. And then the twins turn eighteen, and he's there when they come out of school. What does he want, they ask him. He is come to claim one as his bride.