Well people, this chapter is the proof reviews do make me update faster! I don't usually post on Sundays, but the overwhelming response I got for chapter three pushed me to make an exception. Thank you so much to all the readers I could not thank privately. I hope you'll enjoy this M rated chapter!

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When he was alone, Tony took a deep, calming breath, before walking to the bathroom. Once inside, he stripped of his clothes, fumbling with shaking fingers at his belt and zipper.

Despite his attraction to other men, Tony had never been with one. He had always been too concerned about what could happen if he made a pass at the wrong guy, and had ultimately decided it was best if he stuck only to women. However, he knew the basics of the act he would soon be involved with Gibbs and the idea of having the older man's cock inside him made him both shiver in anticipation and tense with worry as he stepped under the shower. Suppose Gibbs did hurt him? Not intentionally, of course, but because of his fever and inexperience. Those claws looked quite scary...and what about the fangs Gibbs said would soon appear?

The shower was soon over and, once he was dry, Tony donned Hutton's bathrobe and took a moment to centre himself, before leaving the bathroom and walking to the bedroom.

The door was opened even before he could knock and he stepped hesitantly inside, feeling much like a lamb lead to slaughter.

His eyes flashed to the bed that seemed to dominate the place. The covers had been turned down and a small tube of cream lay on the white sheets.

"What…what is it?" Tony almost stammered.

Gibbs, who was standing by the door, followed the direction of his gaze. "It's the cream I use when my knee hurts. It's safe for...internal use. You will need to...apply it, 'cause I can't do it with my claws..."

Tony blushed crimson at the idea of putting his fingers there, and he rubbed his sweaty palms on the bathrobe. "Okay," he murmured. Then, "Do you have condoms too?"

"I couldn't find any...but don't worry. I'm clean. One of the good things of being half-Bosavian is that I'm immune to viruses and bacteria. I can't catch or transmit anything."

"That's why you're never sick..."

"Yeah."

"Nice."

Knowing he was stalling, Tony gathered his courage and made to walk toward the bed, but his feet refused to move.

Gibbs noticed, and raised a shaking, gloved hand to touch Tony's arm. "You don't have to do this," he said softly, although the younger man could sense how much it was costing him to say those words, when all his instincts were probably screaming at him to take Tony here and now. "I understand if you have changed your mind… This door is sturdy and there are bars at the window. Go away and lock me inside…so I won't come in search of you…"

Those calm, yet anguished words snapped Tony out of his paralyzing fear, "What? I should lock you inside and let you die? I don't think so! Yes, I'm afraid Gibbs, this is something unknown, but I won't let you die, so don't say something like that ever again." Then he shook his arm free and marched to the bed.

Once there, he turned to Gibbs, who hadn't moved from his position by the door, and removed the robe, baring his body to the older man's gaze.

Gibbs' eyes blazed at the sight of his naked flesh. He swallowed hard and his fists clenched at his sides.

A shiver coursed along Tony's spine as he noticed the prominence tenting the older man' slacks.

He gulped, lowered his eyes, and picked up the tube. Then he turned to face the wall and smearing his fingers with the cream, he reached out behind his backside, and used them to prepare himself. Tony blocked out every thought as he did to his hole what he had done only to a couple of his more adventurous girlfriends. He didn't want to think of Gibbs, who was probably watching his fumbling, or of what would soon replace his fingers. He just pressed and stretched himself until the moment he judged he was loose enough—or so he hoped.

Putting away the cream, he climbed on the bed and stretched out on his stomach, dragging a couple of pillows under his body until he felt comfortable.

"I'm ready," he mumbled, against his folded arms. This wasn't how he had imagined his first time with guy would be if he ever had the guts to try. He hadn't expected to feel like a virgin – which he was – on a sacrificial altar. He had thought there would be seduction, lust, kisses, caresses, some groping...

He heard a rustle of clothing and then the bed dipped as Gibbs sat by his side. Tony almost jumped. A leather-covered hand posed over his shoulder and squeezed gently.

"Try and relax, Tony."

"Easier to say than to do, Boss," Tony replied, turning his head over his shoulder to face the older man and his eyes widened for the umpteenth time that day, as he noticed the fangs now gleaming against Gibbs' lips. The four, long canines gave Gibbs a very feral, dangerous look and Tony returned to face in front of him, afraid that if he kept looking at that strange being that was his boss, he would lose all of his courage and run from the room, from the cabin and out into snow banks surrounding them.

The bed dipped again as Gibbs straddled Tony's prone body, and stretched along his back.

"Can I proceed?" he whispered near Tony's ear.

"Yes…do it."Let's pull out this tooth, the younger man thought, burying his face into the pillow.

A hand spread his ass cheeks and then something big and blunt started pushing against his opening, followed by the gut-twisting sensation of Gibbs' cock sliding inside him.

They cried out in unison, one in pain, one in pleasure. Tony hadn't been prepared to be stretched so much, to be filled so much and his body tightened in reaction, trying to expel the intruder.

"Give me a moment!" he almost yelled, breathing hard and gripping the pillow case so hard he almost ripped the fabric. God, this hurt!

Gibbs froze, his breath ragged too. He ran his right hand up and down Tony's sweaty back, trying to relax him, but the touch of the rough, cold leather on his skin only managed to exacerbate his current distress.

"Take it off!" Tony said roughly. "Take the gloves off...I don't care about the claws, just touch me with your hand..."

"Okay."

The gloves were thrown away and a few seconds later a warm, calloused, familiar hand returned to caress him, claws lightly raking his skin, as a soft voice murmured, "Take all the time you need, Tony."

Tony forced himself to relax. The pain was fading into pressure now, and he felt a bit better. Gibbs felt so damn large inside him, but the discomfort was now bearable. "You can continue. Just go slow."

"Okay." Gibbs began to push in again, very carefully, giving him plenty of time to adjust.

Finally, after what felt like an eternity to Tony, the older man's chest pressed against his back.

"Are you…all the way in?" he asked, voice a bit shaky.

"Yeah. You all right?"

"Yes…just don't move yet. Give me a few minutes to get used to it."

"Of course…anything you want," Gibbs hands once again caressed his back and sides, with an up and down motion that made Tony think of the times he had seen his boss sand his boat. The absurdity of having such a thought in a situation like this brought a smile on Tony's lips and helped him to relax. "You can move now," he said quietly.

Gibbs let out a relieved sigh and slightly pulled back, before pushing in again.

The sensation wasn't too bad, and Tony relaxed even more, releasing his grip over the pillow now that he thought the whole experience wasn't going to be too painful.

Atop of him, Gibbs moved, pushing and retracting, his movements fluid, his breath fanning Tony's damp skin.

Then the older man shifted, changing the angle of the penetration and the next time he thrust, Tony gasped aloud.

Gibbs stilled at once. "What is it?" he asked anxiously. "Did I hurt you?"

Tony blinked his eyes. "No…it's just you brushed something…inside. My prostate, I guess. The sensation was odd, but pleasant. Can you do it again?" he asked hopefully.

"Of course," Gibbs answered, relaxing and moving again.

Tony moaned aloud when that spot inside him was brushed again and again. This is gonna be much more pleasurable than I thought, he mused as he felt his cock swell and harden in response to the stimuli.

He wriggled his right hand between his body and the mattress, grasping his erection and starting to pull and tug at it, as Gibbs kept trusting into him.

Without even noticing it, Tony began arching against Gibbs, as his pleasure mounted and his hand moved quickly up and down his shaft. His labored breath now matched the older man's, whose thrusts were now deeper, harder, faster, as moans and groans were torn from his lips.

Two more thrusts from Gibbs, two more strokes of his hand, and Tony went over the edge. He cried out as he spilled his seed on the pillow, barely noticing as, atop of him, his boss' body shuddered in release too.

When Tony recovered his wits, he found himself lying beneath Gibbs' spent body. Without thinking, he reached out near his side, finding the older man's hand and interlacing their fingers.

"How are you?" he whispered.

Gibbs raised his head from his neck. "I'm good. You?"

"I'm good too. It was much better than I expected… I liked it," he added, almost in an afterthought.

"Good," Gibbs rolled off to stretch near him. There was a slight grin on his lips as he regarded him, and Tony found that the sight of his fangs was no longer as distressing as it had been a few minutes before.

"So," Tony asked, letting go of the hand he still held. "Can we rest a bit? Or do you need to do it again?"

"I think we have a couple of hours before the Fever rises again. Plenty of time for a nap and a meal, if you are hungry."

"Good. Wake me up when you need me," then Tony closed his eyes and let sleep envelop him.

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Not a very romantic or passionate scene, uh? But at least Tony had some fun. What do you think? I know some of them were expecting some animalistic sex, but remember that Gibbs said to Tony they had better to start before the pressure get too strong, so he could be more in control...and Gibbs' self control (or lack of) plays a role in this story...I also wanted to write a smut scene that was somehow different from the usual sex scenes, where everything is loving, wonderful and right... I hope you enjoyed it.

Let me know and remember reviews make my day and make update faster!