Seems contradictory.

I think Feilong is somewhat special, an exception of sorts. He has to be, or else he'd be dead long ago, as this was not the first time he "touched" Aki and Asami let him get away before as well, even when he did far worse things than in this extra. Plus I don't think you can really blame Fei for that threesome - he was about to let Aki off the hook, but Aki insisted to suck him off because he wanted to show up Asami (after Asami asked him to). So Asami didn't really have more reason to erase Feilong than before.

Completely agreed with that. Indeed Fei is special, he would have gotten rid of him in an instant like he did with that guy who took Aki to Mikhail from that elevator.

It kind of bothers me too... but if I'm going to be petty, then the extra was before the chapter where he said that haha xD (and thinking about the extra as AU fixes this problem in my mind :P )

Stormpen btw, your profile picture is SO ADORABLE (≧∀≦) I can stare at it for hours... x3

I agree. Fei is special. Also I don't think Asami is worried that Aki would leave him for Fei. If Aki runs away, and Asami thinks Aki could be running to someone else, then that someone should hide.

just want to make sure, when you say "fei is special" - you don't mean something like fei can sleep with Aki (in the present plot) and asami won't choke him up right ?

No. I mean that Fei has established a complex relationship with both Asami and Aki, and that Asami does not really want to kill Fei (and Fei does not really want to kill Asami). I don't think Asami expect Fei to get together with either Aki or himself in eh future or that they'll have a permanent threesome--just that Fei is special, whereas some other person may already have been dead for trying what Fei did.

I always thought that part of extra is out of plot. So it's like funny chapter as filler but not 'in story'

yeah I prefer thinking of it as AU too x)
Haha it's called a kawaii potato for a reason :D