Number 1 is Xander goes to Tara or willow For products that don't smell a lot cause he's thinking about getting involved with Spike and want to let his natural smell come through. He might already be involved with spike can't remember that bit.
Number 2 They are all going out to a club with the LA crew and when Xanders getting ready one of the girls ask him if he wants to dress to get bitten or not bitten. Later after the club they find pictures of their outing on a website devoted to Vamps. I think there is a scene in an elevator also between xander/spike and angel/buffy where they hint at sharing for the night.
Any help would be great have been looking for these two stories for awhile.