Yowzer! Honey pie, do you HEAR what you are SAYING?
"Thing is, right before she met me she would simply go out to bars and have sex with random men. Most of the time it was in cars because most of her lovers were married. Yes she actually told me this. I have even met two of them and they are both married scum."
Ummmmm....and then....
"Im not what you call a MILF hunter but I was hoping for a long term FWB type relationship. Monogomy has it's benefits and I prefer that over wearing condoms and saying my prayers."
WHAT about her past history makes you think it would be safe to go without condoms with her? Really? Even if she has a negative AIDS test now, do you really think she's stable enough for you to trust she's not having sex with anybody else on the side?
You are falling into the classic sucker trap - the "White Knight" thing feels good and all, she looks up to you, etc etc. ALMOST ALWAYS on these boards, when this scenario has occurred, the woman ends up taking advantage of the man or she ends up going right back into the gutter she PREFERS to swim in.
You needed someone, rescuing her made you feel good about yourself, etc etc. We get it. But this issue with her son is just the tip of the iceberg. Get out. Get out now. Get out.