Yesterday when I picked up S17 from work (again he works at restauarnt with stbx) I had lunch there. S17 and stbx sat down with me. When I was leaving stbx initiated hug and accidentally made me touch her breasts. She said "sorry" and as we hugged I touched her other one purposely without anyone else noticing. Not a big deal, but worth noting. Then I asked her if she liked my new jeans, because I'm not sure I do. I had to move my untucked shirt for her to see. I jonkingly said "don't look at my ____" She said "I can't help it. It's right there" and pointed.
Apparently being nice to her again, has made her feel comfortable enough to be nice in return. That's better than how things were going a couple weeks ago.