Turgon
Oh boy, when you first menstruate around Turgon, the poor King of Gondolin is thoroughly worried and panicking about why you are bleeding from your nethers! He asks if you are okay? What's the matter? Why are you bleeding? Do you need to see a Healer?
And when you tell him that's normal, he blushes deeply, trying not to look so undignified (further). Explaining to him that it's menstruation and what the purpose of it only serves to make him blush embarrassedly. He's not embarrassed by you, it's just a conversation about the reproductive system of a menstruating human most certainly catches him off guard.
Turgon doesn't ask anymore questions, nor does he really talk to you about it. He will try really hard to listen to your period complaints, but they only serve to make him blush and uncomfortable. I cannot promise that he will be making any kind of eye contact of any kind. Unintentionally making you uncomfortable, it takes some time for him to warm up to it, but he does eventually!
Turgon does ask what it is he can do to... make you comfortable. He has a healer ready at your disposal should you need it, gives you plenty of time to rest and definitely tries to work in time to spend with you to be a little more affectionate should you need or ask that of him!
Glorfindel
This warm ball of sunshine isn't entirely clueless about humans and their menstruation cycles. He has spent little of his time around it or reading about it. While logically he knows you menstruate, it surprises Glorfindel the first time he encounters it with you. Glorfindel is worried he has hurt you somehow or another, even if the placing of blood on your clothes and sheets show that he couldn't possibly have hurt you.
Glorfindel is quick to try to get you to a healer or a healer to you, wanting to make sure you are in fact okay. Though when you explain to him that partially, you are okay and that the bleeding is normal; he is quick to simmer down. The ease with which you speak of it is what brings him to trust you on it, and he attentively listens to you. Glorfindel also asks you a lot of questions about it, as it is human men he is used to being around, so his knowledge about your reproductive health is not extensive. He is also quick to help you clean up any sheets or clothes that need to be taken care of, or take over gathering the items while you clean and situate yourself.
Glorfindel will do what he can to take some time off during your worst days of menstruation and is unfortunately not exactly tactful about it at first. You will have to tell him if it bothers you, in the event you find it embarrassing, as he has no shame in announcing it. Because he will straightforwardly tell them "Y/N is menstruating I am afraid I am unavailable until further notice.". Once you tell him, Glorfindel will keep that talk between you, him and the Healers if need be. When he can't be there with you, he instead sends a healer in to check on you and bring you the things you need.
Ecthelion
Ecthelion is very methodical, so when you menstruate for the first time around him, his first thought is to figure out why and to clean up. Once the notion of normalcy about this has been made, Ecthelion is quick to strip the bed and have the sheets sent off to be cleaned.
In the meantime, he quickly and calmly directs you to clean up while he works on getting tea sent up to the room. When you are finished, he sits you down and asks what you mean by that it's normal. He listens attentively and only asks what he feels are the important questions- 1. Is this normal? 2. How often does it happen? 3. What all do you need for this occurrence?
Ecthelion will make sure from then on out that your periods are handled like clockwork, as he remembers every little detail about you. So your period will run smoothly without a single kink in the plan. During these times he trusts that if you do need him, that you will tell him you need him or come see him to do so. Ecthelion doesn't mind your company while he is working if you need him.
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Tolkien Headcanons and Imagines Vol II
FanficContinuation of where I post all of my writing from my tumblr - The Elven Haven