Hi! Help please!

There was this manga I read a while back. It might have been shounen ai, but I'm not sure it was actually labeled as that.

I'm just going to list all that I can remember of it.

There are three brothers.
The oldest owns a detective agency. The other two brothers try to help out.
The second oldest has a fear of women, but he's really popular with them. He's very much like a house wife.
The youngest cross-dressed at one point in the story.

There was a client that wanted the brothers to look into the validity of the relationship her idol was in. The second goes on set to check things out. He becomes friends with the male idol. There was a scene where they were sitting together and the male idol was talking about relationships and what he was looking for in a girl. Second brother pulls out a canister. Male idols all like wow he fits all the requirements, and eventually, the guy transfers to the second brother's school.

And that's where my memory stops.

Thanks in advance. It's been on my mind lately, and I've tried searching for but... sighs.

Is it Usotsuki Boyfriend?

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Quote from zombieproof

Is it Usotsuki Boyfriend?

Yes. Thank you so much.