There is no risk for an STI here.
From the kissing, you might get oral hsv1, which isn't considered an STI, and that's only if you don't already have it.
From pushing the champagne into your mouth - no risk for an STI.
From eating the strawberry - no STI risk. Perhaps maybe you could get E. coli, but that's not an STI.
From all of this, of course, you might get a cold, strep, the flu, covid, but no STI risk.