In a world where people are actually running around with secret techniques I think I would do my best to avoid someone walking up to me saying "secret technique" and trying to touch me.
So he can do non-invasive top surgery... fuck, this guy hit the power lottery jackpot. This shit works on anyone! Dude can solve a large portion of dysphoria in a few sessions.
I give up. This combo of him having a harem-maker skill plus having a girlfriend is not working out for me. This "I should ask my gf first" is too dumb and annoying in a manga like this. Dropped, and good luck for those who will persist.