That stupid blond monster has gotten much, much too close to my dearest gardener! I had to do something to make sure Saku-saku understood that he can't let Monster-chan own him! Because Saku-saku is mine and no one else's! Of course he should already just know that he's my gardener but there's no harm in a little reminder, right? Right! Anyway he shouldn't be associating with such monster—Izaya would be extremely upset if he knew! I saved him, I helped him realize he's better off without that stupid Monster-chan!
Regardless of the sacrifice Saku-saku had to make I'm sure now he realizes that he can't be around stupid, stupid Monster-chan anymore! He knows better now. Saku-saku won't let that stupid blond monster come back to his garden—if he does I'll have to punish him again and again! Dearest gardener—don't be so stupid! Izaya wouldn't like it, you wouldn't want to upset Izaya, right? After all he can be really scary when he's upset, Izaya isn't as sweet as he makes himself seem you know? He's really unstable—more so than I! And the very idea of his sweetest alter befriending that horrid beast whom he loathes more than anything in the entire world would simply break his heart and make him mad, mad MAD!
I promise anything he would've done would be far worse than what I did to you, sweet gardener. Physical pain fades but Izaya would have definitely fucked up your mind—a lot more than you already are! Though you aren't fucked in the same way as the rest of us, right? Your own crippling insecurities keep you from venturing out into the big bad world—keeps you locked inside of your own little world; pretending there's no such thing as monsters! But you've tried to befriend one—one under the guise of a normal person, of someone who desires peace! He could never be given peace, he's too volatile you know.
He'd only hurt you—precious gardener, don't you know? He'd hurt you even if he didn't mean to! Monster-chan has no control over that disgusting strength of his—he's completely awful! So please understand, Saku-saku! This was all for your benefit! It's all for you.