Daughters Panties

Since my daughter was 14 I have been obsessed with sniffing her panties she is 19 now and having sex she told me, safe sex she says. I wank off rubbing her panties all over my face licking the gusset. Twice she has caught me stroking my cock while doing it, she just smiles and says nice. Last week she came in my bedroom reached under her skirt and took off her panties and gave them to me saying she just orgasmed in them, enjoy. I am now thinking should I or am I out off line, you know what I am thinking