Released in 2006, Boku no Pico was produced by Natural High. It was marketed as the first "Shotacon" anime, specifically targeting a very niche adult demographic. Unlike mainstream series, it was released as an Original Video Animation (OVA), meaning it went straight to home video formats.
Some streaming platforms allow users to upload or request subtitles. Even if "Boku no Pico" isn't directly available with Portuguese subtitles, you might find a user-uploaded version. boku no pico assistir online legendado em portugues patched