I am lost - and scared for them all. They are 14, and as some men have said, "willing" and most likely "thoroughly enjoyed" the experience. This 37 year old married mother of a female classmate 'sexted' them, snuck out at 2am, picked them up, got them drunk and then "taught" them stuff, sneaking them back before 6am- later texting to ask if they enjoyed it and she was willing to teach one on one. I don't care if they were "parties to the incident" 14 year old boys arranging for alcohol and sex with this predator does not reduce her criminality nor make them in any way culpable. But, I don't know if the other parents think that way, and I know the prosecutor doesn't. I had to force the issue for forensic medical exam; I want her hide nailed to the wall. These are boys with no history of any substance use or abuse - with plenty of access in their homes - not even one beer has ever been sneaked...
It sounds like you you need to get your local law enforcement involved.
1. sexting is illegal
2. solicitation of a minor for prurient means is illegal
3. if she touched them sexually then she is on count for aggravated child abuse.
4. she is probably on count for other charges depending on your location.
5. she has probably violated your property rights and is personally responsible for that.
Probably other charges apply. We don't know where you are or what law enforcement you have recourse to. If you are able to, hire a private detective to accumulate some evidence and then bust her.
Also, find a good counselor for your son. You may have to restrict his friendship and exposure to the other 2 boys (if I understood you correctly). If I were in your position as it appears to stand, I would even consider moving my household to get your son into a different environment. Of course I don't know what resources you have available.
If you're in a job that keeps you from being with
your son as a mom should be then you need to change your lifestyle. Do you have a responsible father-figure for him? You only have a few more years and they are gone
. Again, and I don't really know who you are and I don't really know very much about what's going on in your household, but if you aren't leading a good lifestyle and example in front of your son, then that's really where the battle is lost.