Bora-ssi

Teenaged boy lives impoverished alone in an abandoned area. His old neighbor is dying and gives him a gun and money. The old guy tells the boy to kill him, which the latter does.

The old guy killed a lot of people and asked the boy to give some of the money to the victims' families. The boy goes to one of the victim's relatives and finds out they're yakuza. He is then tortured and locked up for not telling them where the money is. He is released by the yazuka's lover who looks female, but is crossdressing.
They both go on the run together. More stuff happens. This is not tagged genderbender or yaoi and focuses more on action/angst- finding family kind of story.

The blonde seme was going out with the black haired uke's younger sister. They broke up. The uke met the seme for some reason and the latter noticed that they both have the same coral pink colored nails(natural). The seme doesn't even remember the sister's face, but only her nails. He is attracted to the uke for that reason.
The uke has a fear of elevators(that was possible fake), one time they made out in one.