Crimson love (Issei x Rias)

Issei is a regular boy, (or so he believes) attending Kuoh Academy. At a young age, Issei lost his parents to a "mysterious accident" and he's left to fen for himself in a world surrounded by a ever looming darkness.

One day, during school, Issei is running to class after an interaction in the hallways, when he runs into the queen of the school. Rias Gremory. Instantly, he's allured to her. The way she walks, the way she smells, the way she looks, and the way she smiled at him and her eyes lit up.

An incident happens later that day, and said incident changes these two teenagers fates forever.