Harukoi Otome

Similarities: - Hentai harems where there is one main love interest but the guy gets sidetracked along the way - High school students and the guy has known some of the girls for a long time Differences: - Harukoi Otome has sibling incest 

Similarities: - Harem hentai centered around students at school - Both include the same female archetypes Differences: - Harukoi Otome has a little incest - Doukyuusei has many, many more girls with many more archetypes 

Similarities: - Hentai harems with girls of varying body sizes (both big and small breasts) - Similar art styles Differences: - Harukoi Otome has incest - Idol Kouhosei has a loli (Harukoi Otome just has an underdeveloped girl despite not being very young) 

You got a Cute Brother. You got a Cute Sister. They develop Romantic Love for each other (not just fucks) in this Extraordinary Hentai. Difference is in Harukoi Otome, there is only 1 sister, and in Mune Kyun! Heartful Cafe, there are 2 sisters creating a mini love triangle. Harukoi Otome got way better sex scenes, but I highly recommend both if you want a happy, satisfying incest Hentai. 

Titles are hentai genre and they focus on romance between a heroine and protagonist, and they both receive a happy ending. Watch one with the other if you want to see happy endings. 

The same studio. Same character design. In the OVA same school. In the visual novel the main character is from this school 

one male student at an all female school 

similar plot. the main character gets transfered to a school and end up being the only guy in his class and thus the object of all attention.