Notes:

Height difference
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"You're Dio Brando, aren't you?"
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"Yes, and you must be Jonathan Joestar… Sir."
(…Huh? …I had heard we were the same age.)
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"Oh, no, don't call me "Sir"! We're the same age after all!"
(Ah, so we actually are the same age…)
"Call me "JoJo"! Nice to meet you."
"Y-yeah… Let's get along…"
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I want to recommend to all of you to check this jojo doujinshi made by utano. I'm just going to post page 2 so you can enjoy the rest.
https://danbooru.donmai.us/pools/6532?page=1
You're welcome.