Houyou Jikken
Kinda funky pacing. Chunks of time were skipped, which took away from the potential to really get you in the heart, but the art was nice and who am I to tell you that you can't sleep with your fictional cousin. The story: University student Miya lives with an incurable disease that will likely kill him in his early 20s. He spots a flashy man in the university's library one afternoon and is surprised to discover the man, Rei, is actually his cousin who used to visit him in the hospital as children. But even more surprising is that Rei has an interest in biology and in Miya's disease, which he claims to be able to cure.
Koisuru Cupid
A ghost can't rest in peace because of unfulfilled business, so he asks his best friend to confess on his behalf to a man he'd admired from afar. Lawyers who use lawyer-speak in bed. Cousins who look so similar they're mistaken for twins. After a misunderstanding, they get a lil closer than most first cousins do.
Hai To Diamond
A 17yo looking for his missing older brother comes to the city where he meets Joe, a hustler. Thus begins this strange, strange love story. This started out fade-to-black and ended up tastefully explicit, and while the love story between Joe and Otoji was a nicely developed slow-burn, the author threw so much unnecessary drama at them it got ridiculous. I'm not sorry I read this, but it's not something I would re-read.
Ubawareru Koto Marugoto Zenbu
Uhh...I'm not sure how old these people are. They look like adults, but then they'll show up in what looks like school uniforms. A guy who likes boobs and the guy who loves him. That guy works at the restaurant with Yuichi, the ex from the one about the playboys. I like how these characters are kinda...not the best people. TW for incest on the oneshot. Two cousins.
Koi o Suru nara Kono Machi de
When a host club opens in a quiet neighborhood, the residents worry it will cause issues, but the manager wins them over with his friendliness. The older women ask him to befriend a man who runs a recycling shop and has an allergy when it comes to attractive people. Also features one about cousins.
Kanchigai Tokidoki koi
Taira's sense of smell leads him to the person he likes, but they don't hit it off right away. The assault warning is for the main story. Chapter 5 is a ride: a guy obsessed with someone he can't have (his brother), so he gets plastic surgery to look more like him.
Ouji no Kikan