Onironaut. Sentinels forever by L. A. Zabrana. 

When the dreams become real, love has no limit.

Between two worlds, a young dreamer and a sentinel defy dark laws and dangers to preserve their love and save the dreamlike and earthly dimensions from destruction.
Sam, ayoungdreamer,discoversthepower of lucid dreaming and enters the enigmatic dream dimension. There he meets Bastian, a sentinel destined to protect dreamers from dark entities. Against all odds, a forbidden love arises between them that destabilises both dimensions. Trapped between two worlds and facing dark secrets and betrayals, Sam must decide how far he is willing to go to save his love with Bastian and to preserve the delicate balance between reality and dream. A fantasy adventure where the power of dreams can change everything.