I have NN conjunct AC in Synastry with my partner. We’ve been together for years! (He’s the NN)It feels very fated, we also have Vx conjunct Sun and several other aspects....
You will help him mature and learn more things about the way he treats his body. My partner for example has changed his skincare, hair care and the way he treats his body ever since we started dating, in a very drastic but positive way.. You might notice a physical change for sure.... (at least in my experience).
I’ve helped him also to become more assertive with others. The more you stay together and more he will learn from you.
You also have BML on his NN, that means that he might also learn to embrace his own Lilith and potentially add that to his own personality.
There is a video online that explains how Lilith in hard aspects works in synastry. Apparently Lilith conjunct NN is not always good (for the NN person). I’m no sure about it. I feel like when we look at Asteroids such as Lilith, Nessus etc, many people tend to see them in a bad light. I feel like It depends a lot on how you handle your Lilith. That will show how it is going to affect him.