[L laughs, the startled kind. He's sober, preferring to keep his wits razor-sharp around Light Yagami, but he can let his guard down here, can't he? He swallows quickly, with the rationale that he has catching up to do, here.]

Your wording is ambiguous. You don't want someone to walk in on you, or you don't want to get-- fucked, in a place someone might walk into?

[L's not in the habit of interrupting his crisp, formal words with profanity. He trips noticeably over his attempt to match Hector's rougher tone.]