Hi Tatienne, I didn't notice but I also have scorpio moon, virgo asc and chiron conjunct MC
I took another look at your chart and I'm worried about your moon conjunct your south node. This placement makes you a very sensitive person, you may also carry some past life disappointments, I can't elaborate more because I'm a beginner in karmic astrology.
Another worry about your synastry:
since your natal chiron conjuncts his natal mars I fear he may be somehow an aggressive person (if not on the outside, he may have a sort of repressed aggressiveness). Your sun squares his mars, your mercury opposes his moon and his saturn opposes your mars, so there may be some arguments between you both. Your synastry shows many challenges...
Now, what you asked for:
His sun in your 1st house, he's number one for you, his identity or true self stimulates you and you may admire him. There might be a good feeling between both of you.
His venus on your 1st house, you find him very attractive and handsome. You find him very sweet and charming and you are not afraid to please him. (I have this placement with my crush and it sounds very true to me, I also have next one)
His moon on your 1st house
You feel very comfortable with his familiar background and lifestyle. You might be well received and you might also feel "adopted" by his family members.
Planets placements on your partner's 8th house show a strong bonding.
If your sun is in his 8th house, you may feel fascinated and captivated by him, his mysterious side attracts you.
If your jupiter is in his 8th house you are very intimate and want to know everything about the other. You will bring material benefits to him and you will share your resources openly. However, there might be an issue if you share your assets and then decide to end the relationship...
On the other hand, your composite chart is quite good. Sun and uranus on 5th house confirms you both have a very joyful and mostly sexual based relationship. Despite venus square mars and sun square mars placements- which appear both on your synastry and your composite- yours can be a very understanding and tender relationship, composite mercury and venus are conjunct in the 11th house. Venus in the 11th shows you'll love each other strongly and almost obsessively. This placement also shows you'll support each other.
Neptune on 5th house, advice you to look at each other as you really are, to take off any rose colored glass you may be wearing. Uranus on 5th shows you both have a quite unusual relationship, perhaps a very wild one. If you are looking for commitment, you'd better run
I think the charts talk by themselves, nonetheless some people say sexual "chemistry" can be the "glue" needed to make a couple stay together and fulfill a higher purpose. If both of you are sincere about what you expect of this relationship and you decide to move on whenever you notice the relationship doesn't fulfill your real needs, then nothing harmful would happen. I still feel and fear that both of you will be someway hurt, but as long as you learn something trascendental about yourselves it may be worth trying.
Please let me know, in a few weeks or months, how did the astros play out in your relationship.
Best regards.