Can’t he just fuck as an alpha?

I guess, but from the omegaverse stories ive read, its not really pleasant for them to do so, the smell of two alphas pheromones being “disgusting” or “too strong” and can be painful so to answer your question they can but it is not pleasant at all, though some alphas enjoy it

guts reading omegaverse LMAO

Here is an Alpha x Alpha story. The bottom Alpha has a bit of a pain kink. The title is called Aesthetics of Unpleasantness and the link for it is below you.

https://www.mangago.zone/read-manga/aesthetics_of_unpleasantness/

Oh I’ve read it…but not carefully lol. I didn’t know it was painful for the alphas. Sorry.

It doesn't work like that in every manhwa