Jake decided that with a dick this big random erections could be problematic, so he chose to give himself complete control over them. The app not only gave him the ability to control when he got an erection, but also how quickly and how hard it would be. Hypothetically he could make himself so hard, so fast, that he could just rip out of his jeans if he wanted to, and he spent about five minutes just playing with how fast he could get or lose an erection. After he was satisfied that he wouldn't be arrested for public indecency every time he got an erection, he decided to go home where he could experiment more in a more comfortable setting.
As he walked through the mall, he became more and more aware of how many looks he was getting, from both women and men, and he loved it! He decided to take a little risk and give himself a partial erection, which brought him from eight inches to about ten.
After he got back to his apartment he undressed and sat down on his bed to experiment more. Under the control tab there were a couple of other interesting options. One was "pheromones" which was described as being able to release aphrodisiac pheremones when erect or partially erect. They could be effective on one or both sexes and could be used at different levels, from mildly arousing, all the way to uncontrollable lust. He decided to turn this option on, he could test it later when he went out for the night. Another option that caught his eye was the "skill" option. This option supposedly gave him the ability to sense what his partner liked and to effortlessly provide it, making him able to make his partner orgasm effectively as many times as he wanted before he himself came. It also gave him the ability to control the intensity of his partner's orgasm. After he turned that on he noticed that his penis felt strange. He made himself erect and focused on that strange feeling. As soon as he did so his cock started vibrating like a sex toy. He figured that it was probably part of what made him good in bed and that it could probably come in handy.
After messing around with his vibrating cock and purposefully bursting out of a few pairs of underwear and one old pair of jeans Jake decided to go out to meet his girlfriend.