Her dad looks younger than her boyfriend. (is usually something you'd say on a completely different type of manga)
I imagine her parent's extreme fetish situation being the same as her own is just going to get played for laugh, but irl that'd spell ten different shades of issues.
But none of that is as big of a deal as ghosting her boyfriend for three days. Don't do that kids. Best case scenario you're merely inflicting a lot of suffering on your "partner", but there's also a decent chance they figure they should move on since you obviously did…