Hey @SexConcerns incan totally relate to this , having had sever PE in the past.
The most important thing you can do, is not make a big deal out of it. 90% of the time PE is psychological, so the best thing you can do is make him feel relaxed and comfortable.
As @AlexandrinaH said, the fact that he gets easily aroused is not a bad thing at all, now you both need to learn how to control that primal urge. And it really is a primal instinct, men were designed to orgasm quickly, so they could reproduce 1000’s of years ago before they were attacked by rival tribes or wild animals.
subtly introducing toys into the bedroom is a good idea, for him, a cock ring is a great option. This will trap the blood in the corpus cavernosa so even after he finishes he will still stay hard. Make sure it only stays on for 30 minutes though.
going for two round ls is another option, after he has finished round round, the next 15 minutes are all about you. Once he has finished with you he should be ready to go again.
There are things he can do and you can do together to prolong round one. For him, Kegals are excellent for strengthening the pelvic muscles and thus has shown to delay ejaculation. For exercises you can both do, edging is fun and works for a lot of men. He need to learn how to breathe properly so when he is on the edge, he can draw back and continue going.
There’s desensitising spray you can get, gel and condoms. All work, but I found they took the fun out of sex for me and they were a short term fix and not a long term solution.
PDE5’s such as Viagra and cialis are worth trying, especially when combined with a cock ring. They won’t make a man last longer, but generally the refractory period is far shorter. When I used them alongside a cock ring, I didn’t actually go soft and could just continue as if it was round one.
Alcohol is a known substance that will delay ejaculation but he needs to find the right balance. Tipsy but not drunk is the ideal.
Music- a little bit like men are told to think of something horrible when they are close, nice background music will often help with PE.
PE is very rarely physical and nearly always psychological; the more he worries about it the harder it will be for him to beat it.