Bakugo Katsuki [BL 15]

He certainly thought it was a bad joke. Someone had left a small box in his room, a small box with a fine pocket watch inside and a thank-you note about "Hypnosis".

Pff-

He mocks such stupidity, even more so when reading the introduction.

Place the clock, gently swinging it in front of the person you wish to hypnotize; the hypnotist will not be affected by it.

He was reading aloud, what did it matter if he was in his own room.

Bullshit... He grunts amusedly. The person will be hypnotized and you will have three minutes to suggest any thought inside their head, as long as it is physically possible for that person.

I thought it was stupid.

After three minutes, the person will be as usual, but with the idea you've put in their mind... it only works with one person at a time.

Yes, it was stupid, but I would try it with the first person I came across to clear up any doubts.