I Am Your Secret Letter! -Record of a Covert Love Struggle-

密書でござる！－隠密好色奮闘記－
Missho de Gozaru! -Onmitsu Koushoku Funtouki-

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Numasuke's master, the Elder, has sent him to Edo to deliver a very important and confidential letter to a certain young lord. He gets the surprise of his life when the Elder suddenly embraces him - and that's apparently part of the message, too! This may have started as something Numasuke can grit and bear his teeth through, but when their postscripts get racier and racier, can his professionalism ever keep up?

https://futekiya.com/i-am-your-secret-letter-record-of-a-covert-love-struggle/