"I'm sorry, you're right. It was just that I heard some sounds as I entered. I didn't think anyone was still in the office," her voice pauses for a second, "I thought something was wrong, but I guess I was mistaken."
Nodding in silent agreement, Machiko replies, "That's okay; you just scared me." At this point, Machiko becomes aware of the state of her undress.
Machiko's legs close slightly, unconsciously, and her hand pulls at each bra cup, tugging it over her breasts and swollen nipples. The sensation of the soft fabric over her sensitive skin makes me almost moan; only her biting down on my lip prevents it.
All of this happens in the second it takes for the woman to reply, "I didn't mean to scare you, I'm sorry if I did. I'm curious though, did you hear those sounds? Or was that you?"