After the siren incident, Derek developed a nasty habit. He had a constant need to know were Stiles was at all times. Because he knew this was crazy and over protective, he mostly suppressed it. But sometimes it couldn't be helped. When almost everyone you loved got taken away from you, you tended to go to extra effort to keep the ones you had left.

Sometimes, when he didn't have anything else to occupy his mind, he would start to wonder where Stiles was and if he was okay and he would shoot up out of whatever chair he was in, grab his keys and half run out the door to go find him.

It had been one of those times for Derek. His uncle had been more insufferable than usual and his sister had spent the entire evening staring at the TV and the whole thing drove him out of the house. His plan was just to drive around but he should have known better. Before he realized where he was going, he ended up in front of the Stilinski house. Sheriff Stilinski's cruiser wasn't parked out front, but Stiles's Jeep was which meant he was home alone. Good.

After five seconds of debate, he got out of the car and with the effortless grace his alpha status granted him. He climbed up to the roof outside Stiles's window and looked in. Stiles was sitting at the desk in his room, switching between a word document, an academic-looking site and Pandora, occasionally checking an open textbook. Knowing him, he was probably doing three homework assignments at once and doing them all improperly. Derek smiled fondly at the sight and tapped on the window pane.

The younger boy jumped and spun his chair around to face the window. "Derek?" he said. His voice was muffled through the glass. He stood and jerked the window open. "What are you doing here?"

Rather than attempt to explain himself, which he wasn't sure he could do anyway, he leaned through the window and pressed a quick kiss to Stiles's lips.

"That's a good reason." Stiles said. Derek flashed him what Cora was fond of calling his "predator smile" and he grinned back and kissed Derek hard, pulling him through the window at the same time.

Stiles hadn't taken control of their kiss the last time and Derek had to admit that he kind of liked it. Once he was through the window and standing up straight, he continued to surrender his control.

Stiles framed Derek's face with his hands and deepened the kiss, turning them as he did so. They started to walk, mouths still interlocked, until Derek's calves hit the edge of the mattress. He fell backwards, and Stiles fell with him. For a few moments they did nothing more than kiss and roll about, attempting to find a comfortable position. When they were finally both satisfied, Stiles ground his hips down against Derek's and Derek growled.

In one movement he flipped them over so he was now on top and turned his attention to Stiles neck. When he pressed his lips against his pulse point, he felt his heart speed up against his lips and heard him gasp. He smiled into his neck and sucked hard on the pale skin.

"Shit, Derek." Stiles hissed, his voice raspy.

Derek ignored him and turned his attention to Stiles's collarbone, this time sucking hard enough to leave a mark. He was so absorbed in this activity and in Stiles hands clutching desperately at his back, that he almost didn't hear the car pull up in the driveway. He growled again and sat up.

"Someone's coming." He said.

"Shit." Stiles swore. "Dad."

"I should go." Derek said, feeling panicked for some reason.

"My dad is a cop." Stiles said. "He already noticed your car on the street. Just…chill out."

Derek got up off the bed as if it pained him to give up his spot on top of Stiles and straightened his clothes, managing to make it to the desk chair before Sheriff Stilinski knocked on the door.

Stiles quickly straightened his own clothes. "Uh, come in, Dad." He said a little too loudly.

The older man entered the room and looked around. "I thought I saw your car." He said tightly. Stiles's dad had every reason not to trust Derek, he had been a murder suspect only three years ago and the Sheriff had a long memory.

"I was, um, just leaving." Derek mumbled, and attempted to flee, only to realize he'd have to get past Sheriff Stilinski first. "Um, Sheriff." He said. The older mans stepped out of the way and Derek forced himself not to run as he left the room, sparing a quick glance at Stiles before he disappeared around the corner.

Derek drove until he got out of site and parked, cursing himself for his clumsy exit, when his phone vibrated against his thigh. He dug it out and saw he had a text from Stiles.

You didn't have to leave. It read.

Your dad doesn't like me much. He replied.

I know. I'm the only one crazy enough for that. Dad is back down stairs. You could climb back in the window…..

He shouldn't. He should get in his car and leave Stiles alone because god knows the boy deserved so much better than him. But he had never been one for making sensible decisions, so he grinned like an idiot and got out of the car, half running back to Stiles's house. As soon as he planted his feet on the floor of Stiles's bedroom the other boy kissed him hard.

He wanted to do this forever. He wanted to kiss him until both of them were out of breath and their lips were raw, but he forced himself to stop and pull back.

"What's wrong?" Stiles asked breathlessly, his fingers began to toy with the fine hairs at the back of Derek's neck.

"If I'm going to be here with your dad downstairs we probably shouldn't…I mean we get pretty loud." Derek felt a blush creep up his neck and Stiles grinned.

"You're right." He said. "Him coming in to find you half naked on top of me isn't really how I want my dad to find out about us."

Derek smiled so wide his cheeks hurt. "So you want people to know about us?" he said. He suddenly felt giddy. He hadn't felt that way since…in a long time.

"Well, yeah." Stiles said. "I mean eventually we'll have to tell people. I think Danny already suspects something."

"Danny?" Derek asked.

"Yeah, I guess I look really happy when I get a text from you." Stiles said blushing furiously.

"Hmmm." Derek said. He smiled and pressed a quick kiss to Stiles's lips and turned to lead him to the bed. They spent the rest of the night just holding each other and talking. Derek slipped out of Stiles's arms around dawn, thinking that it was getting harder to leave every time.