This scenario and the two following are requests from @MylaByers too! I hope you all enjoy!
There are three women in total, Seiya swore to protect with his life. The first person is Seika, his big sister that raised him like a mother and went missing, when she tried to reach Seiya in Greece. Only thanks to Marin were the two siblings reunited and he could fulfil his promise of protecting her.
The second person is Athena, the goddess he was to serve ever since he set foot in Sanctuary. Marin told him over and over again that she is the person that he is to protect, even if it means to enter hell in her stead. When it turned out that Saori was Athena's reincarnation, Seiya was strongly against serving her. But Saori proved that she matured, that she truly cared for humanity and that she was willing to sacrifice herself, if it meant that humanity could be saved. Seiya swore to protect the young woman that would fight even by herself, despite her having no combat skills.
And the last woman he swore to protect ever since he returned from Greece, is me.
I remember a question one of his half-brothers asked him, when they were all drinking together "If your sister, your girlfriend and Lady Saori are about to fall off a cliff, who would you save first?"
It was quite the mean question and since I didn't drink any alcohol, I couldn't help but glare at the person who asked it. Still, a small voice in my head wondered about the answer Seiya would give. With the utmost confidence he could muster, probably because of the booze, Seiya responded "I will save them all!"
It was a sweet answer in theory but the reality was much cruller.
The incident happened when both me and Seiya were about 20 years old. As far as I am concerned, the enemies that appeared were knights from another universe, something about the knights of the round that travelled time and space. Anyway, they knew about the Saints of Athena, so their smart plan was to attack Tokyo in which we all resided in. At that time I was working and when the attack happened, the building I was in collapsed.
When I regained consciousness, I was trapped under debris and I couldn't free my leg. I didn't want to tire myself out and clenched my chest to calm myself down. That was until one of the attackers spotted me and approached me. By the looks of it, he could sense Seiya's cosmos on me "That cosmos... You seem to be someone important." I didn't dare say anything and watched what his next move would be. Slowly, he stepped closer, his eyes gleaming dangerously and his mouth tilting up to a smirk "Who will come to cry, when I kill you here and now?"
He couldn't find out because the moment he striked for me, he was blown away by a much quicker attack. I covered my head because the quick blow created a strung gust of wind, making dust fly in the air. The next thing I knew, the weight was lifted from my leg and I watched Seiya lift the debris and place it somewhere else. Carefully, he picked me up from the ground and asked with a surprisingly calm voice "Are you alright?"
I breathed out in relief, closed my eyes and leaned my head on his shoulder "Yes... I feel much better now."
Finally smiling, Seiya nuzzled my forehead with his cheek, looking regretful "I'm sorry... I'm late because I needed to take my big sister to a safe place..."
"But you still came for me." I whispered, relieved to finally have my lover with me.
Our good mood was interrupted when the opponent from before threw the debris off of himself, glaring at Seiya "Hey! How dare you sneak attack me?!"
Seiya didn't outright yell, if anything he looked way too calm. But the glint in his eyes screamed danger, ready to strike "How dare you attack civilians and hurt the love of my life to see my reaction?" With the utmost care, Seiya carried me to a spot close to the exit and after he placed me on the ground, he placed his forehead on mine, whispering "Try to find your way to Saori. I promise, nothing will hurt you on your way." He gave me one tender smile, kissing my forehead, before he turned around to face his opponent.
I stayed seated for a few seconds, praying for my lover to find victory in battle. Since my leg was hurting badly, I could only limp slowly away from my workplace. Wandering through the strangely abandoned street, I met Shun who quickly ran to my side "Are you hurt?"
"My leg was trapped." I summarised and Shun used his cosmos to heal my wounds. While he was doing his job, I couldn't help but ask "How did you find me so quickly?"
"Seiya told us your location a few seconds ago. He told us to protect you because they seem to target people we come in contact with regularly." Not long after he said that to me, Shiryu and Hyoga arrived at the scene, ready to defend me against any enemy.
It kind of felt like Seiya unleashed an army for me.

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Seiya x Reader Scenarios
FanfictionThis fanfiction will be full of scenarios in which a female reader is dating Seiya from "Saint Seiya". You guys are welcome to make requests in the comments and I hope you like my ideas of how Seiya would handle a girlfriend.