 If you liked
Charisma AV Danyuu no Ore ga Omocha nanka de Iku Wake Nai!!!
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 ...then you might like
Moto Yakuza ga BL Sakka ni Natta Rashii.
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a guy agrees to be topped by another man as a part of work, and is surprised by how much he is into it. he is pretty oblivious to the top's affectionate hints however, and keeps denying their hookups being anything but work, until he gradually realizes his own feelings.