The secret (Malec)

Alec have been sneaking around leaving the institut at night and coming back the next day, no one knows where he goes and Jace keeps trying to get him to tell him but Alec wont tell a soul. he is secretly dating Magnus Bane the high warlock of brooklyn, and his mom hates Magnus thats why they keep it a secret Alec hate hiding their relationship but all the hate of hiding and scared if someone finds out. but all his problems disappear when he get to kiss and cuddle with his little Warlock, but what happens when Magnus get pregnant? and is affraid to tell Alec and then Alec find out and confront Magnus about it.