

Sharpies are made with alcohol-based ink, and alcohol happens to be the perfect solvent for cleaning up dried acrylic paints. So what’s really happening is the tip is getting gunked up with re-wetted paint.
I’d bet you could give the tips of those sharpies a brief soak in some isopropyl alcohol, and/or a firm wipe with a wash cloth or paper towel soaked in the isopropyl, and they could be somewhat recovered (assuming they have plenty of ink in the tank)
That being said, I still would not recommend this practice. Better off with a paint based marker or something.
Man you should really talk to someone about this clear obsession you have with the sex lives of teenagers. It can’t be healthy to spend this much time thinking about it in this much detail.