This is a plausible conclusion.
I wanna hold onto this because there's no way the author will make let the uke escape from the house with an evidence (the sunglasses) just like that especially it's recorded evidence and thus, strong. I think the next chapter is where the horror starts for him directly.
I've been thinking he might just end up leaving *without* the glasses for one reason or another, though (for example, the author might break or take them under some pretext or something like that). I don't know why, but I just somehow get the feeling that he might want to drag out this "game" he's playing with him for longer. Of course, I may be wrong ╮(￣▽￣)╭
But I personally think it would be more interesting story-wise than just him being imprisoned.
The seme will probably threaten to kill the guy who is tied and see if the uke will react since we all know he's quite perceptive and thinks the uke is not really blind. So the uke will probably make a decision, to let the guy be killed or blow his cover by defending him.
I feel like uke is gonna let the guy be killed to not blow his cover but the seme will admit he killed the guy and he will also threaten the uke as an accomplice to the murder since he didn't do anything to stop it. So he will be forced to stay with him as the new hostage.
But this is only a prediction, take this with a grain of salt.