Assuming the latter, Matsuda walked over and opened the door slowly, wincing when he saw that it was dark. Great. L really did sleep. Just as he took a step back, he heard a sharp intake of breath. Blinking in confusion, he opened the door a bit more and stepped inside the room. Squinting in an attempt to see better, he stumbled his way to where he assumed the bed was. His shin colliding with the mattress confirmed he had found his designated target, and he put a hand on the mattress to keep from falling on top of it.
It was then that a pair of sharp teeth latched themselves onto Matsuda's arm, and then he suddenly felt a pair of legs wrap around his waist and a hand tugging on his tie to bring him down. Wide-eyed, he looked at the face in front of him. In the dim light, he could see L looked curious.
"U-um, Ryuuzaki-san...?" Matsuda stuttered out, face suddenly becoming red. Half-expecting the position to change - maybe having L let go of him - he was half-surprised to see L made no move to let Matsuda go.
"Oh. It's you, Matsuda-kun..." L said simply. "I thought it was an intruder."
Furrowing his brow, Matsuda blinked down at L; Aizawa had enough trouble getting into the building every day, if the day where he walked in clad only in his boxers said anything. He doubted someone would really be able to break in without L knowing.
"W-well, I'm not, so could you let go...?" Matsuda asked.
"Judging by how you came in after me, and the blush on your face, I'm assuming you like me as well," L said, his legs letting go of Matsuda's waist and kicked at Matsuda's legs, so he fell on top of the older detective. In the movement, his lips collided with L's, and he lay there with a deer-in-the-headlights look as they kissed.
If his eyes could get any wider, they would have, as he felt a tongue probing against his lips. Gasping slightly, his mouth opened enough that L could slide his tongue into Matsuda's mouth. Letting his tongue explore the insides of Matsuda's mouth, he finally felt as if he had done enough and had his tongue rub against Matsuda's, trying to get Matsuda involved as well.
A bit too stunned to do anything at first, Matsuda slowly, shyly, joined in. After a moment, they seperated, Matsuda gasping for air and L panting slightly, a small smile on his face. Shifting so he was on top of Matsuda, he looked down at the younger man before reaching over to the table-side lamp and turning it on. Settling back to his original position, L simply looked down at Matsuda before letting his forehead rest on Matsuda's.
"I'm glad," he whispered, his hands gently feeling Matsuda's sides. Delighting in the way he could feel Matsuda twitch underneath him, he moved in for another kiss. Matsuda's hand, however, stopped him. Confused, L looked down at Matsuda.
"This isn't a joke...?" Matsuda asked. "You really do li... you really do?"
Pecking Matsuda's lips, L's hands found Matsuda's.
"Yes, Matsuda-kun. I really do."