Oh, thanks for replying!
I've chosen the preset where I had relationship with him in S1 (therefore there's their child too), so during the camping with Virion and the Champion in the forest, MC said to Virion something about that she needs time to think about their relationship. Or at least I understood it that way. And after that Virion says an innuendo from time to time, MC laughs and I don't get any flirt options. Buuut if the CG is only for a preset without the past relationship, okay. I thought I missed something.
Thanks again!