Monetary love?
Hmmm... no that wasn't it :(
It's such a common trope tbh, do you remember any other details?
It is... Tbh I'm not sure it was even a yakuza seme... I just remember the uke having to pay them back all the money with his body. In one chapter the went to the seme's family home (I think it was near the end) and they wore kimonos and such. The seme had a lot of brothers and they all went to a festival where I think they confessed their love
Does anyone remember a yaoi where there is a yakuza seme and the uke owns him money so he pays the yakuza back with his body. The fell in love pretty fast. It's not very recent manga but I just can't remember the title or the author