Jake is a character in a Life of Holly game. He lives in a house in a 'Hot Springs' district, and you must choose a "House" starting location to meet him.
Jake wakes up in the morning, takes shower and leaves for school. In the afternoon, you can meet him in his room, doing homework.
You can interact with him during the day to increase his interest in you. This will gradually turn your relation more sexual. In time, you will need skills unlocked to increase his interest more (Handjob, Blowjob, various positions...).
Note: In version 0.3 of the game, Jake was a normal NPC interacting with Holly, however as of version 0.5 there is now a scenario which turns him into a playable character. For more info see Life of Holly (Jake scenario).