The turning point is when she invites you to the spa, do not decline her when she does, the rest is ez.
She will be asking very obvious questions to which you can give very obvious answers.
I said "no" because of my money situation (had JUST had to give landlord a bj because I missed first month's rent by $10) , but now I don't see her or can contact her on phone. There really should be a second chance for these things if you miss a shot because of conflicts or unavoidable situations.
Are there any Yuri scenes with Lisa? She really is the best-looking secondary character and I think should have more of a role in weekend events- shopping, nightclubbing, hot lesbian sex, etc.
If you're going the Corruption route, may I suggest Chelsea taking a babysitting gig and having sex with the kids? Or perhaps getting a dog and some bestiality action? (I'm just giving possible options.) There's more to Corruption than just stereotypical bondage outfits, you know.