i will be prejac from just "experiment with less intense physical stimulation and less intense visual" ?????

i love my partner and and i want to provide a good PIV when she need sex, but during the last week i developed the love masturabating with less intense physical just moving my penis 15° up and down with one finger, watching normal girls in instagram and then switch to Porn when i'm about to come, and it took me around 30 to 60 min to finish, and i had a blast, it's my best sexual experiment so far.

i love that but i don't want to be prejec because of it, i'm having fun because it takes me so long to come, so my questing is :

1- decreasing physical stimulation to lowest lvl will make me prejec ?
2- masturbating on (my triggers) just normal hot girls in Instagram then switching Porn (pussy) when i'm about to come will make me prejec ?