Uwa-koi

Ever since he was a young child Sora Aoi had always exchanged words of "I love you" with his older sister Aki. Now, as he comes of age, he finds it much harder to exchange such comforts as they did in those simpler times. When Aki demonstrates her feelings toward him to go beyond a sisters love Sora finds himself questioning his feelings for his sister. Realizing their affection for one another they consummate their love in secret.  In a society that would never understand, they must now keep their love a secret from their family and everyone they know. With a boisterous twin sister and friends that want to be more than just friends, Sora will find it wont be so easy. Hormones raging, you can be sure that Itosugi Masahiro's "Aki-Sora" will be a sure-fire drama that you don't wanna miss! Warning: Nudity and graphic situations!

Yukiteru is living with his family friend Yuno after a fire burnt down his home as a child. They live their life until a fellow classmate Rena who is jealous of their close friendship makes a surprise move. 

Sakurai Sakuya is a first-year student that hates summer. One day when he's verbalizing his hatred towards the sky, he is spotted by Kisaragi Haruka, a second or third year student. (It's only said that she's senior to Sakuya.) Haruka is the only member of the art club of the school and ask Sakuya to model for her. He agrees not knowing it would be a nude model. Then only covered by a small blanket, Sakuya gets aroused by the thought of him and Haruka being all alone in the club room, which is an old storage shed. Haruka is entranced by Sakuya's penis and keeps touching it, which leads to have Sakuya cum all over Haruka's face. Sakuya thinks that this is the end between them, but Haruka warmly sees him off with the words "See you tomorrow". Thus their fragile love begins.