Edging

Can you masturbate than do p.e right after?

You can, but it could slow some of your gains depending on what your going for.

Generally if you are doing girth work hold off. It’s a little harder to keep an erection after you blow a load. I’m not a doctor, so take this with a grain of salt, but I feel the blood that fills your member before a nut could be more nutrient rich.
Alternatively, If you are hanging or using an extender and you can’t stay fairly soft. It’s probably OK to do 30 minutes before.

If you are just asking about edging it’s great to do after every workout. It could even be used as a kind of warmup before some girth work, though I wouldn’t do too much before a heavy routine.

I think you may be confusing edging and masturbation. Edging is similar except you don’t finish.