Hentai Manga like Ore no Oniku-chan

Torotoro Hitou de Koi, Hajimaru.

Also known as A Steamy Romance Blossoms at the Secret Springs.

Status: Finished
Genres: Romance

Iharu is a university student looking for ways to kill time over spring break. In passing, he meets an attractive young man named Shin who invites him on a trip to the hot springs. He accepts Shin's offer and finds himself at an elegant inn with outdoor baths and hidden springs--not to mention luxurious meals and amazing sake... Lost in his happiness, he decides to enter the hot springs with Shin. But when he looks at the young man undressing, he can't believe his eyes... "Even his dick is gorgeous! His butt is so shapely!" Even after Iharu turns in for the night, he can't stop thinking about Shin's amazing body... and growing increasingly horny.

Collar ni Kuchizuke

Status: Finished
Genres: Drama , Romance

Miki Kuroda, a college student, was forced to wear a collar in the past and has come to reject Doms due to his trauma. However, his body continues to seek for more, and he deals with the overflowing heat by reading erotic novels.

One day, when working as a babysitter, Miki meets Moriya, a Dom. Despite being confused, he manages to finish his work, but happens to go into heat. Moreover, when he finds an erotic novel, Moriya notices his lower half-!

Hadaka Yorimo Okufukaku

Also known as More Than Just the Physical.

Status: Finished
Genres: Romance , Slice of Life

Hagiwara, who works a desk job at a college, picks Yuto up at a club. Yuto states his inexperience, and Hagiwara, attracted to his good looks and hot body, decides to show him the ropes. The two part ways, albeit reluctantly, after an enjoyable night together... only to cross paths again...! Despite Hagiwara's shock, Yuto coolly suggests they become friends with benefits!

Sensei Kimochiii Koto Shiteagemasu

Also known as Hey Teach... I'll Make You Feel Good.

Status: Finished
Genres: Romance , Slice of Life

"I'll shove it all the way in this time around."

Saeki is a university professor who has just found out that his boyfriend of two years was cheating on him with a woman. At a bar, Saeki gets incredibly drunk, confuses the person sitting next to him for his ex, and ends up getting nasty with him in the restroom. The next day, a student comes up to Saeki after class. It turns out to be the guy from the bar! His name is Yamamoto, and he apparently came to pick up where they left off...!

This is a story between a cute puppy-like student who can get a little rough and a university professor who likes it that way.