The soft little licks and tender nuzzles make his heart skip and his cock jerk feebly at the attention. He's slumped a little, bracing against the wall as he pants for breath, staring down at the man. He grins lazily at the compliment. "So do you," he murmurs in return. When Derek tells him to stay his heart melts a little and smiling softly, Stiles nods. "Of course."

After a few moments, Stiles pushes off the wall and slides down Derek's body to instead collapse on top of him, head resting on his shoulder, draping his arms around the older man. "I'll stay as long as you want me to," and he doesn't just mean a sleep over, either. He means way more than that.