it is normal for it to be super sensitive, but not hurt!

As said in the other answers, most men’s erections “die” after ejaculating. A man’s penis can get “sensitive” after an orgasm, too.
Take it easy. It is blood pressure that keeps your penis erect. If you want a better orgasm, wait a day or two. In addition, exercising makes for killer orgasms.

well if it’s like the 4th time in the day or you ejaculated before recently then it will get sore or hurt.

no

It is not uncommon for it to hurt. The fact that you get it hard again is a lucky thing for you. Most guys are a once and done. It could be the pain from the sperm shooting through the vessles because of the blood in the tissues the opening is much smaller than when you urinate and would be uncomfortable. I know when I have to urinate after sex it hurts like heck. Not fall on the ground pain like from a kidney stone. ( they really hurt like hell) but a very uncomfortable burn.

Sounds like you might be working it a bit too hard. You may need to take it easy for a day or two, at least.

if u do it too many times per day, it will hurt.

depends on how bad… if its tolerable… but uncomfortable…then maybe…
also depend on how it hurts. if uve rubbed it raw…. yes… ill hurt… if it hurts inside thats something else.

but if its realy painful… then id get a doc to look at it… then ya know for sure./