That girl from the club
For the better part of this year i've been dating this girl, we met at a club and went straight off to bed. it began as a casual thing, but the attraction was way to strong so we moved on to a relationship, even though i'm way older than her (she just turned 20, i'm 32). you tend to ignore that since she's such a goddess in bed, best sex i've ever had and probably will ever have from now on.
here's the thing. a while ago we started talking about our families, and some stuff she said about her dad sounded startingly familiar (particularly the bit where he walked away from her mom after learning she was pregnant). after digging around a bit, last monday i learned we're half siblings. we have the same dad. unknowingly, i've been committing incest almost all-year round.
fast fordward to yesterday, friday. i didn't tell her shit, and instead went ahead and fucked her all night long. i think the knowledge of it actually made it better, and now i'm actually kicking myself for being such a sick fuck. i loved doing my sister, and now i don't know if i should tell her because i want to keep things as they are.
You should feel out her attitude to incest and, if amenable, inform and continue. You've been given a gift
Ask her to marry you
Keep your big mouth shut. Don't be a dumbass and ruin it.