I'm in a D/s mood, so using hypnosis for some form of obedience is the name of the game. I also enjoy a mindfuck, so accomplishing this through changing her perception, putting in triggers or tricking her into being submissive somehow is a nice bonus. Can be on the giving end depending on circumstances.
Keeping it Sneaky
Konoka and a partner getting intimate in a semi-public or public spot where there is a risk of getting caught. Magical or mundane means of assuring that they aren't caught is fine, I'm more interested in the locale and the thrill of 'getting away with it'. A character keeping up appearances while a hidden partner works them over works too. A particular interest to wearing toys or restraints underneath clothing, especially under nice dresses!
Breastplay/Breast Worship
Listen, I like chests, okay? Can go either/both ways. Expansion is fair game, as long as either party doesn't get into ridiculous levels.
Bondage through manhandling
Doesn't matter if it's through good ol' human hands, magical restraints come to life, or monster critters coiling around someone via snake body or tentacle, I want to play out someone getting tightly restricted and squirming in it (and likely finding some aspect a turn on). Konoka herself getting captured is easy, tempting her to do this to someone is slightly trickier unless she already knows they are into it (though playing out said temptation is fun too). Konoka and another getting handled together by a creature works (this is F/F only though), as does the admittedly goofy idea of one transforming into a bondage-y monster and being tempted to ensnare the other.
A sensual fall into captivity is a loved bonus for this prompt or even hypnosis, as part of the fun is the futile resistance (and yes, this can be played consensually too). To give you a visual idea: something like this.
Onmyouji
It's only vaguely touched upon in canon, but I like the idea of Konoka wielding her magic, ideally leading into one of the above situations. Maybe overestimating what she has to offer with a spirit and getting bound/fucked/transformed for her efforts, or somehow gaining control over someone and struggling to deal with it ethically while still being horny about it.
Konoka Konoe | Mahou Sensei Negima | OTA
Keeping it Sneaky
Breastplay/Breast Worship
Bondage through manhandling
Onmyouji