Actually last 2 flashback scene completely contradict Ana's character and the way developer plan to extend the story with extra tease for 1 more year or the very concept of slow burn.
On one hand he said Ana is shy, she just had a baby, she is faithful, she "thinks" that her husband cheated that might be the possibility for her to cheat / kendra and her friends are trying to corrupt her or she took alcohol, or her husband business goes down and he need money.. that's why she got corrupted. and story is progressing one day at a time.
On other hand in these 2 flashback, ana is having a baby, she dont think her husband cheated, she is not taking any alcohol..in case of Mr. Stenstromber yea a little vulnerable during funeral but no money issues...and she allows touches, kisses groping and everything beside sex. . So i dont count the story as slow burn as ana was already corrupted beside sex part when everything was going fine with her.
So extended tease concept will contradict itself with upcoming situation and I dont know how slow burn will fit in the story if Ana already allow groping , touches and kisses without anyone's involvement or anyone forcing her for corruption. She enjoyed other men touches and tease when everything was fine.