Of course!

"Of course!" You eagerly replied before shaking his hand. There was a sudden searing pain in the palm of your right hand. You winced as you felt the pain, before pulling your hand back to your body. "What is this?" You asked the old man as you saw a strange pentagram with unusual writing burned into your hand. It seemed to be burned into this strange form you were currently inhabiting. You guessed this form must have represented your soul. It seemed to darken ever so slightly after the handshake. "It's proof of our pact." He said with a warm, and disarming grin. You had completely forgotten about the fact you had to kill the hero. If he really is as bad as you think he is, you won't have a problem doing it,though.

"Now, for the fun part. Deciding your appearance and skills." His grin seemed to grow wider as he said this. You were surprised to hear that you were going to decide your appearance. You thought you were just gonna decide your skills, or "job". Like in all the manga you've read. You did find the idea of picking your appearance appealing however. "How do I do it?" You asked with a grin just as big as the old man's. "Just close your eyes, and imagine your new body. Don't ya' dare open them until it's over." He said with a smirk knowing you were curious why you had to close your eyes. You were tempted to open your eyes during the process but decided against it.

You shut your eyes before hearing a chuckle escape the old man's mouth. "Don't forget your demonic features, son." He said with what seemed to be fatherly pride. You smirked at the thought of the old man being your father. "Alright, Gramps." You said back jokingly as you began to imagine your new body. You began to imagine masculine features on the face before arranging them in a way that would be the most pleasing to the eye. You worked your way down to your body. The image of bursting muscles was nice but you toned it back(haha word play). You imagined yourself with toned muscles. Not enough to look like a dumb brute, but enough to make yourself look good. You didn't even realize a smile was crossing your face as you felt the transformation begin to take place.

You weren't done with deciding everything however. You decide to go with the hair color you had on earth, a nice inky black. You thought about your eye color but you already had one in mind. You had always thought about what you would look like with deep crimson eyes. The image in your head of your new body was nice but then you realized you got to decide everything about your body. You smiled even wider at this fact. You imagined yourself with the cock you always wanted. It was eight inches when soft, and grew to an insane twelve inches at full mast. When you were satisfied with your body you felt your form shifting into place to match the image in your head. You made sure to shut your eyes tightly to make sure the process went smoothly. As you felt your body shift you grinned as you decided your demonic features. You decided to base them on the old man's when he transformed. They would be the inkiest black you've ever seen. You decided on compact horns, massive wings, and a long thin tail. The horns would be useless for attacking, but your wings and tail might be useful weapons in combat.

Just as you were done imaging your whole body, there was the same unsettling cracking sound that the old man's body made when he transformed. Then, your entire body felt like it was engulfed in flames. It was the most excruciating pain you've ever felt. It didn't even compare to when you were hit by the truck. You heard screaming as you tried your hardest to keep your eyes shut. It was your screaming and you didn't even realize it. You were too focused on the image in your head and making sure your eyes were shut tight to notice. The pain felt like it went on for an eternity. The pain subsided and the shifting feeling had disappeared. When you opened your eyes you realized you were on your hands, and knees panting like you had just finished a marathon. You were sweating buckets as you felt your new appendages. You felt your wings rise and fall with your breath. Your tail was wagging back and forth gently as if it was wading in water.

"Impressive, David. Most people pass out when they turn." He said with what sounded like happiness in his voice. You didn't even bother to look up as you slowly regain your breath. "Thanks, old man." You said through pants as you felt your heart start to slow down to a regular pace. "Now for your skills." He said eagerly before you heard a heavy thud as something hit the floor. You looked up as your breathing returned to normal. There was a massive pile of books in front of the old man. "What about clothes?" You asked slightly embarrassed as you realized you were in what seemed to be a normal body now. It was the body you had in your mind and you couldn't help but grin.

"Just think up some clothes and they'll appear." He said offhandedly as he seemed to be searching for something in the pile. You simply shrugged it off as you imagined a set of clothes. It was a simple black t-shirt, black jeans, a red hoodie, and red sneakers. With boxers and socks of course. You really liked the colors red, and black. Now they seemed to fit well, considering you were now a demon. The clothes appeared around your body as you opened your eyes. You stood up slowly and realized the clothes accommodated for your new demonic features. You were still getting used to your new appendages but they felt like they were meant to be with you. You looked at the old man as he seemed to find what he was looking for. It was an old dusty book. It seemed to be centuries old. "What's that?" You asked as you looked over the books. They all seemed to have the same strange writing that was on your hand. You looked at your palm again and saw the same symbol from your deal with the devil. 'It must really have been seared into my soul.' You thought before suddenly hearing the old man speak. "It's the skill book." He said nonchalantly before handing it to you. You realized this book was in English. "Skills for another world", was all that the cover said.

It was pretty cheesy seeing the book, but it was still funny nonetheless. A smile spread across your face before you opened the book. There seemed to be a table of contents. It was organized into different sections based on their rarity. "How many can I pick?" You asked not even bothering to look up as you began to read through the book. "Four." He said with a smile, but there seemed to be something he was holding back. You simply shrugged the feeling off as you explored all of the skills.