I think it might have been because 1] Caim didn't last as long, 2] he was mostly just using his body as a shield near the end or she was distracted by Kalego-Caim, and 3] Azz did it alone while fighting with only his flames
While rereading I noticed on the status making machine in ch. 220, under his special category is "charm." It could just be cause he's handsome [Crocell also had charm], I'm gonna lean more towards his mother
I love that the mc can have a bunch of platonic relationships with people, both male and female. It's a nice change of pace from falling in love just cause they spend time together