I, am conflicted about my 19yo son

I and my 19 yo son live together and each morning I take him in a mug of coffee and biscuits. One morning last week I opened his bedroom door to see him masturbating, he quickly stopped and covered up, I smiled, saying “You boys will be boys”, put his mug and biscuits on his bedside table, and quickly left.

Then yesterday morning, I opened his bedroom door to see his shorts pulled down and him masturbating again, but this time he didn’t stop and one part of me wanted to walk out but the other part of me wanted to continue watching, but after a few seconds he came all over his bare chest.

He was very apologetic saying that he “was too close to the edge to stop”, so I sat on the side of the bed and tried to reassure him that he’d done nothing wrong, it was perfectly normal and masturbation was good for his heath, but I emphasised good hygiene practice, like washing his hands afterwards and before eating. I said that I will provide a box of Kleenex on his bedside table and a bin for the used ones, and a yellow (his favourite color) washcloth and towel for use when he washes his dick: he has a sink in his bedroom.

Surprisingly while I was sitting on his bed, he didn’t cover his dick and I must admit that I couldn’t but help occasionally glancing at it, as it is huge, much bigger than his father’s and has a nice purple head. After he left for college, I had to have a long masturbation session thinking about his dick.

Consequently, I am conflicted, so I created this account and came here to ask for your advice. Did I go too far when sitting on his bed, and discussing masturbation, or am I overthinking it. I don’t know I how to proceed, as he is a fit fairly muscular guy and he does have an attractive veiny dick, and I enjoy watching guys masturbate, but maybe I should put this completely out of my mind!

Today, I waited until he surfaced before taking in his coffee, so nothing untoward happened today.