Help!!!!! Yaoi finding

Sr for trouble you guys but i'm looking for this Yaoi: Seme is an assasin/mafia from the past and suddenly was brought to the present, he didn't know what to do then saw Uke, he used a piston/gun to threaten the uke to help him(??? i don't remember much) and go home with Uke. Uke is kind of disturbed but has no choice and let the Seme stay at his house. Sometimes the Seme disappears for awhile and go home with lots of money in hand, so it makes the uke wonder if the Seme did sth illegal and if he guessed the Seme was an assasin was right... After all none normal citizen have a gun with them, right?
The art was absolutely stunning!!! the seme is a Europen with black coat like Mafia....i just read 1 chap like ...last year or so and still waiting but i forgot the tittle and been looking till now
Thanks for your time reading my SOS message !!!!