Boy/boy siblings love adult

Ever since he was young, Miharu has suffered from phantom pains. When his divorced parents decide to reunite after 15 years of separation, he discovers the exact reason why: his younger brother, Natsu. Apparently, he and his brother are astrological twins. Miharu feels Natsu's pain, but what does Natsu feel.

Collection of oneshots:
1) Oujisama no Boku
Commoner Hino is just grateful to be able to go to an elite high school. When princely Faran approaches the shy Hino because he's interest in the lives of ordinary people, he's reserved at first. But Faran is so outrageous and charming, does Hino's heart stand a chance?
2) Honeycomb Child
Sex, lies, love and incest are just the beginning for twins Hachisu and Keito.
3) You are my Lollipop
4) My Bully (Boku no Ijiwaru)

Shuji Yashiro went to take pictures on the school rooftop rumored to be haunted by the ghosts of twins. That was where he met his classmate, Roku Ichinose, whom he always considered to be someone belonging to a completely different social world. He couldn’t take his eyes off Roku’s face, and took his picture on impulse. The following day, while he was organizing old photos in the clubroom, Shuji found a shocking photograph.

nohara Minato is an only child who was raised single-handedly by his father since young, after (believing) his mother passed away. When he skipped club activities one day, an exact replica of himself showed up, claiming to be his twin brother who was separated from him when their parents divorced. Just what is going on between their parents? And as more obstacles come his way, what will Minato and his twin’s relationship blossom into?