sir harrison james ulysses slytherin, the lord of hellsing

i have been inspired by a story on fanfiction.net called out of the night, which was an inspired story in and of itself, this story will, be a lengthened version of out of the night, with some changes

harry potter, the man-who-conquered, and the new lord of the ancient and noble houses of potter and black, and the earl of slytherin, is summoned before queen elizabeth, who wishes to reward harry for his services in fighting against voldemort, she also forms an arranged marriage between him and the new lord of another family, that leads the most important organization in england and maybe the entire world, the hellsing organization