You're forgetting something: porn games' MC's have magical cocks. Their dicks can't compare with those of real men. They are miraculous, they work wonders. They can corrupt landladies, roommates, mothers, sisters, aunts, cousins, teachers, female police officers, angels, demons, aliens... Even nuns!
Along the same lines, they can correct the most hopeless whore.
Don't underestimate the power of an MC's dick. If anything can straighten Vanessa out that's definitely some serious dicking with our MC. Mark my words, she'll be a devoted housewife in no time.