Men have sexual desires. Sex is just one of the desires that humans crave for like food or sleep. They can be difficult to resist and sometimes it's a loosing battle. When it comes to those three desires, it's only natural a person would feel that way. Sometimes, you get an unexpected surprise where your desires come from an unexpected source. That is what's happening right now with a man that goes by Natsu Dragneel. He was asleep, but he was feeling something pleasant as he moaned.

"Oh... Right there..." Natsu moaned as he felt it. That was when he felt something was a little off. He looked and saw there was a woman in his bed. She was blonde and wearing a purple two piece with leggings and loves that reached her shoulders. He was surprised to see her, and even more surprised with what was in her mouth with his pants opened. "What the hell?!" He shouted as he sat up in surprise. "Who are you?! How the hell did you get in my apartment?! What the hell are you doing?!"

"What does it look like?" The woman said as she finally removed her mouth. "Are you saying you don't want this?"

"What? Who the hell are you?!" Natsu questioned. It was then he noticed something off about the girl. He just now noticed the horns coming out of her head with her also having a thin black tail. "What the hell are you...?"

"My name is Lucy." She said as she moved her arms closer and caused her breasts to pop out. "If you must know, I'm actually a succubus."

"A what?" Natsu questioned.

"Don't know what that is? Fine. You don't need to know." Lucy said as she took her hand and slid it against him. Natsu couldn't help it. Seeing this strange woman was arousing him as he felt blood flowing into his face and into a lower part of him. "Now, I didn't come here to talk." She said as she continued what she was doing earlier. Natsu didn't even try to resist it. It felt too great to him. This Lucy just remained there and continued what she was doing as she felt her tongue sliding against him. She only added to it when she took breasts and coiled them around "it" and add to the pleasure. Natsu wasn't even tryin to fight her off. She played around with her breasts and used them like they were massage balls with her moving her head side to side.

"Oh god!" Natsu called as he couldn't take it anymore as he erupted right in her mouth. Whatever she did felt so great that he fell back on his pillow. What she just did already made him feel a little sleepy. Once she got what she needed, she climbed up and stood over him with her licking her lips.

"That should do for now, but I'll be back." Lucy said before Natsu closed his eyes and fell asleep. When he woke up, Natsu shot himself straight up. He looked around and didn't see that woman anywhere. He thought the whole thing was just a dream, but he looked down and saw his pants were open. That's not how he went to sleep earlier.

...

The Library

Natsu couldn't get that woman out his head. What she did to him was better than any woman he's ever been with. with how soft her lips and skin felt. No woman has even done what she did before. She called herself a succubus, but he has no idea what that even is. So, he hit the library and tried doing some research as to what they were.

"Here we are..." Natsu said as he found a book on mythology that mentions them. "Succubus are female demons that feed on the sexual desires of men. The more they feed, the more life they drain out of their prey." That means that woman wants to kill him by pleasing him. Since he was still alive, it tells him that she'll be back. Natsu knew she'll come back, but his life could be in danger. Does he dare risk his life for something that feels too good? The sad truth is, just like smoking or drinking too much alcohol, one can't help themselves and take the risk.

...

Natsu's Apartment

Natsu knew that woman would be coming back. Whoever or whatever this succubus is, she made it clear that she would come back. All he could do was wait for her until then. He couldn't find anything to keep her away, and he wasn't sure if he even wanted to. He sat in his bed and awaited for her arrival. It was already late and he was getting sleepy.

"Where is she? She said she would be coming." Natsu said. He tried to keep his eyes open for when she showed. When he had them closed for a moment, he opened them back up and saw her right there before him. "You're here!"

"You were waiting for me. How sweet." Lucy claimed.

"I know what you are now. You're trying to take my life, but I... I can't seem to stop myself from..." Natsu said as he felt drawn to her. It was like he was hooked and he can't seem to cut the cold turkey.

"You want more knowing the danger. You're not the first." Lucy said as she stretched out her tail and used it to cut open Natsu's clothes with him now just in his underwear. "Well, now that you know the truth, this can be a lot more fun. You can have some real fun."

"Real fun?" Natsu questioned. That was when Lucy's body began to change with her skin becoming more tanned with her hair turning auburn.

"I can make myself look completely different to fit your desires." Lucy claimed. She changed again to look like a regular human. "I can make myself look like any human." With another change, she looked like a cheerleader. "I can even have myself dressed however you like." She changed again to look like lamia. "I could even make myself look like any creature." She changed once again and looked like Black Cat. "I could even be someone fictional." A change once again, but actually looked like a gorgeous man. "If you want to experiment, I could even look like a man. It's really your choice." Lucy claimed getting in Natsu's face.

"Uh... Actually, I think I prefer your normal form." Natsu said. Since that's what Natsu wanted, she changed back into her regular form.

"So be it." Lucy said. "In that case, are you ready?" She said as she had her tail slip to her top and cut it open with it falling off. Natsu couldn't take it anymore. He tackled Lucy and pushed her against the bed with him placing his lips against her breasts. He held her arms down and sucked against her like he needed a fresh bottle of water. Lucy cried with delight. "Hey... I was suppose to take the lead." She claimed, but Natsu couldn't resist anymore. He kept her pinned down and continued sucking against her breast. Lucy let him do it as she tried moving her tail around again as she reached for Natsu's underwear and pulled them right off. Once she did that, she kicked him right off to the other side of the bed. With that, they switched positions and Lucy was the one sucking on him now like last night. Natsu could even hear a slurping sound coming from her. A clear indication she was enjoying this with how her tail moved around.

"Oh god!" Natsu cried as he couldn't help how he felt. Even if she is sucking the life right out of him, it just felt too good. She pulled away for a moment as she planted some butterfly kisses against his muscles before restarting what she did. "Get up."

"Hmm?" Lucy questioned as she kept doing what she was doing.

"Get up!" Natsu shouted as he grabbed a hold of her and tossed her off him and off the bed. He practically threw her against the wall and pinned her there as he reached for the bottom half of her attire and tore it off. Once that was done, Natsu pushed himself right against her from behind.

"Oh! You impatient boy!" Lucy teased as Natsu smashed himself against her while keeping Lucy pinned to the wall. Lucy helped as she took her tail and wrapped it around his waist to keep him there. Natsu used that to help move her without separating from her. He smashed her against a table now and had her pinned against it. He grabbed her by the horns and pulled her head back as he kept pushing against her. Lucy felt her body being stretched out on the verge between pain and pleasure. Lucy came here to please him, but she was the one getting pleased with how she gripped the table with Natsu pushing her body to it's limits. Eventually, she screamed out as she felt her bottom half release something. To Natsu, it felt soothing and warm, but he wasn't finished.

"Undo your tail." Natsu said. She did so without questioning. He threw Lucy back on the bed and got right over her with them now facing each other. He held both of her hands with her wrapping her legs around his waist. Once there, Natsu pushed against her front, smashing against her. Natsu didn't lose his pace at all with the bed moving from their own movements. Both of them taking shallow breaths from the exertion they were feeling. Soon, Natsu couldn't hold back anymore and ended up giving Lucy what she came for with her tightening her legs around him. Once it was done, the two of them just stayed where they were and took deep breaths. The two of them just stared at each other with Lucy trying to read his mind.

"Expecting a kiss? Don't hold your breath." Lucy said as she stretched out her tail without him seeing anything and was getting ready to stab him with it and taking his life. "Don't think I'll actually kiss you because..." Natsu didn't let her finish that as he was the one that kissed her. That was too personal for Lucy, but she didn't exactly refuse it.

"If you're going to kill me, just do it." Natsu said when he pulled away. "At least I'll die happy." Natsu was more than willing to have him die like this. Some people just can't tell when too much of a good thing was dangerous for them. He was going to kiss her again, but she freed her hand and stopped him from doing anything.

"Truth is...killing you is my least favorite part of this. There is another way where you don't have to lose your life." Lucy said. "So, I could spare your life providing you be my little plaything." That means they can continue what they're doing and Natsu wouldn't have to die. Sounds good to Natsu, but again that can be a problem. With your judgement clouded, you end up making a deal with a devil.