A/N: Lol, sorry if this makes you uncomfortable, but I thought to myself "what kind of crappy boyfriend would I have if he didn't take care of me in this time!?" So, you see, I simply had to ;O I also thought they were cute ♡

Magnus: He will do anything for you. Anything. He'll listen to complaints and rants, he'll watch tv shows and movies with you, make you food (unless he just 'magics' it there), cuddles, and also gives you body rubs. You always sleep horribly turning this time so he'll make you a special drink to ease off whatever you are going through and also helping you to sleep. 

Alec: He always acts a bit awkward the first day, but by the time you are curled up in bed crying with cramps, he takes action. Giving you medicine and making you stay in bed. You tend to get very aggressive during this time so (with Simon's help) Alec will have you play video games. You love it and have fun, but also have a really difficult time with pain, when this happens, he will simply hold you and let you cry. Also wishing he could help you more after buying you loads of junk food.

Simon: At first, he tried to get you to hang out with Clary, but then he found out that you felt hurt that he wasn't around you, so he changed. Always talking, joking, kissing, and being the best boyfriend you could imagine. He would watch movies with you or go on walks, play board games and cook, pretty much whatever you wanted! Simon hadn't realized how emotional you were in these times, always clawing for him and becoming lonely when he wasn't there, so he took this time to let you know he loved you very much. 

Jace: He was extremely uncomfortable the first time he found out about this, Izzy had told him when you couldn't make it for training. After hearing more about it, he became genuinely concerned. Hearing how it happens and seeing the pain you go through made him as protective of you as protecting you from a demon! He started being more affectionate with you and would even watch mundie movies! When you felt really bad, he would set up a hot bath and read to you, holding your hand all through it.