Light is in the middle of breaking up with Misa when she says something incriminating and now Light has to stall for time while Ryuk moves the evidence. L is watching everything through surveillance cameras and when Light didn't get to the point and break up with Misa fast enough, L shows Misa footage of him and Light having sex. Hilarity Ensues:
Light: Misa, I admit I've been having sex with Ryuzaki, but it's only because he's so much better looking than you.
Light: Well, to begin with you're too skinny. You should put on some weight. Also, you shouldn't dye your hair. And I hate the gothic lolita style. You should wear regular clothing, like Ryuzaki does. There's nothing wrong with a t-shirt and jeans.
Misa: But he's a guy! That's disgusting. And he looks horrible. I don't think he even brushes his hair… It can't be. Why would you do this? Light, how do I stop you from seeing him? Is he blackmailing you?
Light: Misa, I'm not breaking up with you. I can't resist Ryuzaki because I have very exact sexual requirements that he meets, but there is no need for us to stop dating because of this.
Misa: You'll leave him?
Light: No, Misa. I told you I can't resist him. The real reason I couldn't leave headquarters is because he always wants to have sex and I give in every time. We're almost constantly doing it. It started before I ever met you. We had sex while we were going to college together. That first night I met you, when you came to my home, and I kissed you, I was thinking about fucking him while we kissed.
Misa: Light! Light!
Light: But we don't need to break up, Misa. Let me talk to him. We've had threesomes before, so maybe he'd be willing to let you join in, if I phrased it just right. However, you definitely have to gain some weight first. You don't turn me on at all the way you are now.
Misa: Threesomes! Threesomes!
Rem: Light, you're tormenting her!
Light: Yes, Misa. Matsuda has joined us quite a number of times, and a few other people as well on rare occasions. In fact, I think this would work best if you seduced Matsuda, and then I introduced the idea to Ryuzaki. Yes, why don't you gain a little weight, and seduce Matsuda, and then after that I'm sure Ryuzaki won't object to you joining us. We'll all become a nice stable foursome. You want me to be happy, don't you, Misa? This will make me very happy, and you'll be able to have sex with me that way.
Rem: Light Yagami, you're giving Ryuk more time, aren't you? This is... necessary.
Light: Misa, don't worry. Soon everything will be good. Just seduce Matsuda for me, okay? And, one more thing I just thought of. I've never been in anything bigger than a foursome. I'd really like it if you could seduce one of the girls from your modeling agency and bring her along too. Any of them would work. They're all more attractive than you are.