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Best couple in all of the BL I read - Shen Yuan and System. (rofl) They have the best chemistry and are an iconic comedic duo.
Shen Yuan and Airplane; Shen Yuan and Liu Qingge are also good comedic duos. Shen Yuan himself is hilarious. Oh... and don't forget Tianlang-Jun.
Everything else.. Can we call it reverse grooming. I don't know ╮(￣▽￣)╭