 If you liked
Joou to Shitateya
|
 ...then you might like
Mujaki na Wanko to Nekokaburi
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Both stories focus on a couple that not only has a huge age gap, but polar opposite personalities. In both stories we have the youthful blond boy who's enamoured by the dark haired mature man (who coincidentally used to like girls), and how, despite their contrasting personalities, but end up falling for each other.