In Shakugan no Shana when do yuji and shana first kiss?

umm, in shakugan no shana, yoshida confessed her love to yuji first in chapter 20 or 20 up, and shana did told yuji that she likes him in chapter 25(the end of part 1) and in the 2nd shakugan no shana, yuji shout that he will protect shana at all cost, so i would say yuji will chose shana and they live in the same house together. yuji can feel Shana love him, and he choose Shana on that Christmas' Eve.