There are reputable members in the forum that you can buy Bitcoin from but they are mostly in their respective local boards. I don't know if the Spanish local board have one and even if they do, it is up to you to use that route, maybe through escrow. However, many exchanges have already been suggested by @JeromeTash which you can use to buy Bitcoin without KYC but the only challenge will be if you can use them perfectly as some of them are not straightforward. Maybe you can search youtube on how to use some of those mentioned exchanges, I am confident you will find something that will help.