A good amount, and she had overheard him!

"Well, you see, it started with a little phone call you made..." Mirko remarked, smirking.

"Phone call?" Izuku asked, wracking his brain, before realizing what phone call she meant. "Wait, did you tap my phone line!?" he demanded.

"Didn't have to," Mirko replied, tapping her ears. "You were pretty good about keeping your voices down, and making sure you weren't close to Firecracker and I, but I still heard you without even meaning to..."

Izuku stared, before face palming. "Damn it, I'm usually better about learning from my mistakes..." he groaned, remembering when almost the exact same thing happened with Kyoka.

"Yes, and then I decided to check your belongings. You did mention a genie, so I figured you had a lamp, or a bottle or some other fancy container for her, and also figured you'd want to keep something like that close at all times... Next thing I knew, I was in my bedroom, coming down from... Well..." she flushed slightly, her cheeks darkening.

"Yeah... I kind of put that defense mechanism on the Lamp, made it so anyone who touches it without my permission would... Well, find themselves occupied, and forget about the Lamp..." Izuku remarked sheepishly.

"I figured that much out," Mirko deadpanned. "Though I still remembered what I overheard, and my decision to check your belongings. Which made me realize that I probably triggered some sort of defense mechanism. That, or you were just fucking with me with the genie magic, but I gave you the benefit of the doubt. So I redid it, but this time, took meticulous notes of every step I took. The last one being me finding the Lamp, and making the decision to see if I could grab it. And of course, I masturbated and forgot again, but I had the notes this time."

"...then you decided to grab it with salad tongs, to avoid directly touching it," Izuku realized.

"What can I say? They were the most convenient implement I had on hand," Mirko smirked, clicking them a couple of times. "At any rate, I got some advice for you."