Imaginary Guy117's challenge

Butler Issei

While in a camping trip, small firefight broke out between a rag team of Devils, Angels and Fallen Angels. The casualties: a couple dead and Mr and Mrs Hyoudou. Angered and surviving the ordeal, Issei bowed to make every single one of them pay. He was wandering around the before being found by a rich family. They wanted a servant who can work full time to protect their heir. Knowing he has all the time in the world, Issei signs up for the deal. After taking training many self-defense, bodyguarding, gun and knife wielding lessons, and other agent like subjects to master, he's ready.

Here's the restriction:

Absolutely NO reincarnated Devil Issei, nor Angel Issei. Just Batman like Issei, while being HUMAN.

No Rias Pairing. It's been beaten to death. Along with Akeno, please. Only human paring or harem. Your choice.

Issei isn't a pervert since the noble family he was adopted into will kick him out if he did. He is helpful during his non-perverted moments in the canon.

No Sacred Gear wielding Issei. To many of them. I want to see Human, Nephilim(Human/Angel Hybrid), Hanyou(Human/Youkai), demigod or a Cambion(Human/Devil hybrid) to stand on their own with no 'gift from God.'

Optional: he learns magic spells

PM him or me if you want to accept this challenge