"A movie is perfect." not something that Magnus does often himself. It sounds like Alec might talk to Clary about dating him so that is something.

When Alec mentions not going to Downworld places he is understands and has a flash of anger towards the Nephlim for this, but he is willing to go at Alec's pace.

Kindly, "Anywhere with you will be great." he hopes briefly remembering their first date but even that turned out alright.

"Why don't you put your shirt wherever you like and we can be off?"