I don’t know that masturbating after pumping specificaly effects gains in the traditional sense, but I stay hard in the pump better if I am a little sex starved for over 24 hours.
That being said, yesterday, After pumping, I decided to put a vibrator (“back massager”) to my tube. I was almost fully packed and was sitting in a computer chair with my posture in a postition that the tube was pressing slightly against the seat of the chair. I was at about 5hg and I put the vibrator to the tube and HOLY VIBROGASM!! The vibrations went straight throught the tube, through my penis, through the chair I was sitting on, through my entire underside. I have put a vibrator to my penis befor, but it was nothing like this. How am I supposed to not masturbate after I pump now??? How do you just decide not to have the best orgasm you know how to have?? I guess I’ll have to do this only every other session or so. Crap, that was better than the best sex I have ever had. Today too.
Pumping might be different than jelqing and stretching, I don’t know, but you can’t do what I did yesterday and today unless you are in your tube.