Astarion drank my blood and I somehow failed all my charisma-checks. So I died. I had the party resurrect me the next morning. Everything was fine, but I did not replenish my spell-slots. That seems rather counter intuitive. Especially since I'm playing a warlock and my spell-slots should even replenish on a short rest.
Additionally the above-mentioned scene looks absolutely ridiculous, if Astarion is wearing something like a Drow-hood. Consider ditching the helmets in some cut-scenenes