I Think I'm In Love With My Sister's Husband (BoyXBoy) (Slowly Writing)

21 year old A.J. Markus has been living with his best friend for over two years and hasn't seen his younger sister, or any of his family for that matter, for almost a year or so. He didn't even go to his sisters wedding! So when his sister Lyndsey decides to make a surprise visit to his house everything changes and it all started when A.J's eyes landed on Seamus. One look and he was instantly a goner. But what will happen if Seamus ends up returning the same feelings? Especially when he is married to A.J's sister?