adult incest

At that age you’ll be breaking both the laws against sex with a minor and the laws against incest. Sex with a minor is the one most enforced in most places, so I have advise you to wait until he’s of age.
However, about the notion of an older woman teaching a young man about sex: I had a professor from Switzerland while I was in college who said that practice was not uncommon over there. (And in Switzerland it could be in any of three languages too.) I have no idea, though, how young those young men might have been; it probably varied from one instance to another.

i can really relate to you, because i have fantasies like this all the time my self. i had a dream when i was pregnant about my 15 year old son being on top of me, fucking me and cumming in me, and in the dream - he got me pregnant for the second time. the dream was very shocking and had an unhappy ending. (in fact, i died in it). but since then i have had other erotic dreams of fucking my son as a teen and i also fantasize about it a lots. i can not say if i will ever try to seduce brandon in real life, but i do think about it quite a lots. so i sure know how you must feel.