Interim theory, until BK posts the April- June texts.
1. I'm not convinced the killer told him about the sex tape during the May text exchange. (Don't think he would have have allowed her in his house again if she had, and feel even more certain he wouldn't have trusted her enough to allow naked pictures ).
2. It seems he was still angry enough with her to not answer her first many calls from CA on her way to kill him, but 2 longish calls afterwards indicate to me he relented, and likely agreed to have her stop by en route to Ryan's so she could drop off photo CD's, the check, and most important to him- the handwritten copy of his first chapter she had either stolen or neglected to return to him.
3. I think she told him she would arrive in the afternoon, but timed her arrival for around 4am, when she knew he and the roommate would be asleep.
4. I think she snuck into his office first so she could access his computer, read his emails, and plant a virus.
5. I think she went upstairs to avoid being seen by the roommate, but didn't wake up Travis right away.
6. Maybe she went into his bathroom to put the gun and knife in a readily available place he wouldn't notice or check,maybe she also picked up his phone and checked texts to make sure nobody would be dropping by unexpectedly.
7. At some point, midmorning or even later, perhaps, I think she slid into his bed naked. I think she did that to catch him off guard and to make it less likely he would just ask for the things she'd brought and send her on her way.
8. I think her plan worked and they had sex, she took pics, but that Travis wasn't comfortable or happy about any of that.
9. I think he erased the pics the first time she left the room.
10. I think she began to play with him in earnest. Here hon, here are the pics. Let's check them out together before I go.
11. On the computer which now had a virus. She watched him angry about the virus, delighted.
12. Asundry. Check, book chapter, have a swell life chat.
13. I think he thought she had left, went to take a shower, but knew she had returned and knew she was taking pics.
14. I don't want to imagine how he felt then, becsuse I have little doubt he was starting to feel not just irritated but uneasy, if not outright afraid.
15. I think she pointed the gun at him just before the sitting poses, because I absolutely don't believe Travis the germ-o-phobic would ever have willingly sat down in the shower.
In the end I think he surprised and infuriated her even more by not dying where and how quickly she had planned. Don't know about why she left the camera and card but believe she was arrogant enough to think she had pulled off the perfect murder.