Watakushi to Kowareta Kyuuketsuki

Kaede is a female college student who has lived desperately with her younger brother and sister after their parents abandoned them. It was Yo-chan, a young boy who first took care of her after she had been abused and abandoned. "Itsuki-chan will be my princess." Wait a second!? The meal is mouth-to-mouth!? But I've never even had a lover...