So, as you can tell by the title, I can't remember the name of this you manga. I read it a while ago do I don't have all the details down but here what I remember:

• there's a family of four or five brothers and the manga mainly focuses on the second brother and the fourth one
• the fourth brother is in highschool and his teacher does a home visit where he sees the second brother and falls in love with him
• the fourth brother also has his own love story with his best friend or something going on in the background
• the second brother likes to make these vegetable smoothies that no one but him likes
• there's this one scene where the fourth brother is on a field trip to the beach, the teacher is there, and the second brother shows up and the teacher and the second brother end up doing it at the beach
• I'm 90 percent sure the second brother is a host or something
• the second brother is a brocon I think

That's all I really remember.