Make her a little more willing.

"Ashido-san, when I describe my quirk to you, you're going to realized that the thought of it being used on you or anyone else will get you very aroused. You'll find yourself craving my control. When you snap out of this, you'll remember looking directly into my eyes, your mind going blank for a moment, then waking up. You'll believe I didn't say anything during this time," I said quickly, hoping to get the trigger installed before anyone came back. Going over the words once again in my mind and finding no immediate concerns, I blinked, completing the trigger. Ashido's eyes cleared up, and she shook her head as if the clear it.

"W-what was that?" she said, sitting down to combat the dizziness. she sounded confused and more than a little concerned. I rushed to explain.

"I-I'm so sorry, Ashido-san, you startled me a bit and I accidentally used my quirk on you." I said, playing up my innocent student act.

"Woah, that was your quirk? What was it?" she asked, still sounding slightly dazed. I smirked internally, and told her the official version of my quirk.

"My quirk is called Trigger Happy. When someone looks into my eyes, it puts them in a sort of hypnotic state where I can give them triggers. Basically, I could tell them they'd jump when I said 'jump' and they'd follow that. It only lasts for around an hour though, and the person I used it on remembers exactly what the orders are." Those last two bits were obviously lies, but it took so little effort to get them added to my quirk registry that I couldn't pass up the opportunity. I saw the slight change in the look in her eye and the lilac color returning to her face laughed internally. The trigger had worked.

"That's. So. COOL! You'd be a great hero, you could get any villain to turn them selves in, you could get victims to calm down instantly, you could sleep with anyone you want-" She cut herself off as her face went from a light lilac, to a deep purple color, clearly she hadn't intend to share that little thought.

I let out a laugh "yeah, I could do all of those, but I'm not the kind of guy to use my powers on girls to make them fuck me... unless they wanted me to," I said, watching her reaction out of the corner of my eye. She was clearly feeling the effects of my trigger, her face was still flushed a bright purple, she was sweating and even panting a little. Unfortunately, it seems I pushed a little too hard, she bolted upright and sprinted out of the room yelling ,"Brb, gotta use the restroom."

I looked over at her chair she was sitting on and couldn't help but let out a little laugh. Left in the chair was a small puddle of her arousal. I got up and wiped the chair down. After all, I'm sure Tokoyami would probably notice.