Responses
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Found it myself. It's called Kokoro
http://www.mangago.zone/read-manga/kokoro_kanda_neko/
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Ran across it again http://www.mangago.zone/read-manga/kokoro_kanda_neko/
It's just a scene, so I can't give you much backstory. The seme is a dark-haired businessman, and when he comes home the lighter-haired uke is following him around the apartment like he wants to be close but not in the way. The sfx was translated as "toddle". I think there may have been an age difference in it.
That's all I've got, sorry. I probably even have it bookmarked, but without remembering the actual *story* I'm not likely to find it.
Thanks for your help!