Enzai

For me, the two best yaoi anime out there. If you want shota rape and a pitiful main character, who falls into a trap and is exploited, then these anime are for you. 

Hardcore yaoi, with graphic scenes. 

Both accuse of a crime that they didn't commit which lands them in jail. Of course in Amai Choubatsu the female is a lot more timid than the male in Enzai. However both faced harassment/assualt as soon as they enter the jail, but in Amai* she ends up in a male prison instead of a same-sex jail house. 

Slightly less graphic than Enzai. But both present sadomasochistic interactions and rape scenes. Unlike "Enzai", "Finder no Hyouteki" has some romantic undertones.  

Weeell...if you HAVE watched Boku no Pico and/or Pico to Chico then I don't really need to explain 'why' =D It is really hard to find,still,there are parts uploaded in YouTube,though. So,if you're interested in Boku no Pico,little boys having love and ...something else,Enzai is the one.It's not about love,but it IS about the "something else'' and it's classy. 

Is a shota anime (boy love)! 

Inloves shota (boy love) 

They both are yaoi! Um... Shota too.