The first story is about a guy that hires a private detective to find a ex-boyfriend who stole money from him.
The 2nd story is about sex between friends. The uke is straight but doesn't have luck with women, so his friend help him out (doing with him). Is a really funny couple.
The third story is about a Yakuza son and one of the Yakuza men.
I like all of the stories :P
1-en no Otoko