You (male) were moving in with your dad after your mom died from an overdose of drvgs, there you find out he has a rich wife and a daughter, who is your half sibling. Next door 2 boys live, one of them is your sisters boyfriend and the other is single and pretty closed up. You are gay, which your family doesnt know. He is straight and his name is Alex, short for Alexander

One day at the beach your half sister (Mona) pushes you into the water, where you unexpectantly fall onto Alex.