That's My Boyfriend You're Kissing!

Alec only came to Magnus's parties because it made him happy, and Magnus knew it./ But Magnus wasn't and he was seething. When the vampire suddenly kissed Alec, and wouldn't stop, even when Alec pushed and pushed, Magnus had had enough. No one took advantage of his boyfriend like that. Never. He yanked the vampire off of him and snarled, "That's my boyfriend you're kissing!"