Guilty Pleasure

Brian knew that the attraction he had for his Girlfriend's sister was so wrong. He had known Amy and her family for 4 years now.

He hadn't anticipated His girls sister Mia to become so attractive and irresistible.
What made the situation more complicated was that Mia had shared the same feelings that Brian did.

How will Mia and Brian keep their hands off of eacher after the initimate night they shared without hurting Amy; someone who was always there for them.