Hentai Manga like Onii-chan to Sex Kenkyuu

Onii-chan Asobo

Status: Finished
Genres: Hentai

Himitsu no Onsen Ryokou (秘密の温泉旅行, Secret Hot-Springs Trip)
2. Chicchaku tatte Ii janai! (小っちゃくたってイイじゃない！, Even Though I'm Small It's Okay Isn't It!?)
3. Onnanoko na Boku o Mite (女の子なボクを見て, Look at me as a Young-Lady)
4. Imouto Mama (いもうとママ❤, Little-Sister Mama)
5. Onii-san wa Chiisai no ga Osuki?? (お兄さんは小さいのがお好き？？, Is Onii-san Into Smaller Types??)
6. Otona no Koibito Kankei (オトナのコイビト関係, An Adult's Lover-Relationship)
7. Chiisana Karada no, Ookina Koi (小さな体の、大きな恋♡, Small-sized Body, Big-sized Love)
8. Himitsu no Omorashi (ヒミツのおもらし, Secret Wetting)
9. Houkago no Koibito (放課後のコイビト, After-School Lover)
10. Oyome-san Candidate (お嫁さんcandidate★, Bride Candidate)
11. Otona o Oshiete? (オトナを教えて？, Please Teach Me About Adults?)