She's very pretty and really into me. We met three weeks ago at a club. A week later we went on a date and on monday she came over while my parents were gone. She was on her period so sex was out of the question. She tried to suck me off but i couldnt get it up. I said i just didnt like blowjobs. On saturday my parents are out of town so she's coming over again. She expects sex. I dunno what to say if my penis wont work. Any advise?!? Ps: im doing nofap to cure my ED. Im on day 7.