Jacob is a male character in a game Total Seduction. He is the father of Taylor and husband of Angela. He spends most of his days at his office in the Taylor's mansion.
When Nicol is corrupted, she will start having an affair with Jacob.
When Taylor is corrupted, she will have an affair with Jacob too. In both cases, you can join in the affair if you have an appropriate Seduction Level with the girl.
He works for a Magma Corp. and is part of the guest "Hidden Player". You have to hack his computer if you want to continue and you can use Nicol to lure him out of his office.