It seems you're asking for a detailed write-up about (likely referring to Hypnosis Guidance or a related adult-themed anime/OVA series), specifically Episode 16 , and the mention of "trex" and "6 cen 20" — which might refer to a timestamp (6:20), a scene code, or a misremembered title element.
This likely refers to the year 2020, which is when several episodes following the initial 2019 season were released. If you are looking for a summary of Episode 16 saimin seishidou trex ep16 of 6 cen 20
Is this for a fan blog, a database, or a forum discussion? It seems you're asking for a detailed write-up