I am looking for a Yaoi manga about two brothers. (I do not remember if they are actually related or not) In the past the brothers were locked together in a shed when they were younger and the younger one got hard and when they were released avoided his older brother. Years later the older brother thinks the younger brother doesn't like him and is questioning him about that while they explore an abandoned building or something. While exploring a cave in happens and they get stuck and the younger brother becomes aroused again and confesses to the older brother.

Does this manga ring a bell for anyone? Please tell me someone has the name.