Full Summary:
Will solace isn't who everyone thinks he is. War can change a man, and Will has been through two. He snapped when he couldn't save those close to him. He acted happy go lucky and sweet, but he is a monster inside.
Will/Nico from then on is an abusive relationship. Nico thinks he deserves the pain, and Will is happy to get out his aggression on the world by hitting Nico.
Yes. It is very different from most sloangelo, but it is an interesting concept, and I think I'm going to write it.

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Will solace isn't who everyone thinks he is. War can change a man, and Will has been through two. He snapped when he couldn't save those close to him.
Nico had spent less than a day in the infirmary when it first happened. The weird thing was, he liked it.

The Apollo cabin gave Nico a separate room, due to a nightmare he had ,while under the healing process. They got the Hypnos cabin to, as best they could, nightmare-proof the room. Though the darkest ones were harder to force away, so they also sound-proofed the room. Will had been coming back in for his shift, after a quick two hour nap, to check on Nico. Nico hadn't know what to say to Will, because Will was normally sunny and carried the conversation. So, when Will asked what the Underworld was like, Nico blurted out about Esilym. "You'll most certainly go there. I've met a few of your brothers. They really care about you." Nico watched at the shock of Nico's awkward ramble faded from Will's face to form an angered look, a look that Nico had never seen Will carry. "Will?" Will stood up from the chair next to Nico's bed and shoved Nico off the bed in a fit of rage. Nico hit his head on the ground, hard. It hurt like hell and everything spun.

"WHY?! WHY ARE THE GOOD DEAD? IF WE DIDN'T KILL THE GOOD THERE WOULD BE NO NEED FOR ESILYM!"

Will picked up Nico by his shirt collar, and held the smaller, dizzy, boy in the air. Nico tried to process the words, but could only come up with, "But humans have always lived a lifespan-" Will cut him off with a slap, then a kiss, before picking Nico up gently and carrying the son of Hades back to bed, healing the head injury. Nico was in a state of shock, but was blushing like a mad man as Will gently touched him, in sensitive places, to heal him. As Nico's head became clear, he saw Will staring at him lovingly. Nico blushed, and, on instinct, grabbed Will by the neck and pulled the son of Apollo into a dizzying kiss.

Will flushed a bit, before tentatively asking, "So, you liked that, then?" Nico nodded, remembering the pain. It felt good to be hurt, especially since Nico could fault on it being for his own flaws, such as being gay. Will seemed to have no problem with this, as the son of Apollo ruffled Nico's hair and kissed his cheek. "Want me to come again later?" Nico nodded and Will left shortly after fake-charting a 'normal' occurrence.

When Will got back to the Apollo cabin, he cried. His siblings had no idea what was wrong and tried to comfort their lead consular, but he shook them off and continued to cry. Will considered himself a monster. How couldn't he? He hurt the one he liked, and Nico...Nico had enjoyed it! Will had offered to do it again! How could he, a healer, be such a menace? Nico was in a fragile state of self-hatred, which could easily lead to self harm, and Will gave him motivation! Will had no idea what to do, he had been building up his anger inside for so long, it snapped, and like a rubber band, it hurt the one in the way. Will cursed himself, because while he felt guilty, he also had enjoyed it. He had enjoyed hurting Nico. He had also enjoyed kissing the boy. He couldn't wait to do both again, which produced another round of tears, because he didn't want to hurt Nico. Will cried himself to sleep as his siblings discussed in hushed sleepy tones what might be wrong with their consular.

The next morning Nico woke up early. The skeletal butterflies in his stomach flapped rapidly, and all Nico wanted was to see Will again. Nico knew he shouldn't, especially after Will had hit him, but that kiss was spectacular. And the pain made Nico feel human. He wanted to do both over and over again, and he couldn't wait until he saw the spectacular son of Apollo again.

Will entered the infirmary, with Nico's breakfast, an hour after Nico woke up. He expected to find the son of Hades asleep. So when Will saw Nico awake and smiling at him it sparked a blush on Will's face. Will quivered a little, but was happy to see no damage on Nico from the previous night. "H-hey." Will spoke nervously, not wanting to make a mistake. Nico blushed seeing Will, and jumped out of the bed, even though he was supposed to be resting. Nico took the tray out of Will's hands, and placed it on the bed in a flourish that made Will's heart flutter. Nico then cupped Will's cheek and kissed the son of Apollo. Will shivered under a spell of how good Nico was.

Nico was nervous as all heck, but he had been planning this out since he woke up. He would startle Will, then kiss him. It was perfect in Nico's head, but putting it into action took a lot of Willpower, but it was worth it. Will had his arm wrapped around Nico's waist and Nico wrapped his own around Will's neck. The two remained like that until Will had to breath, but once they took their breaths they stared into eachother's yes, and started the kissing up again. It was glorious.

"Hey." Nico smiled, staring into Will's eyes, his forehead pressed against Will's.

Will blushed, replying, "What was that?" Nico's smile faltered, backing up a little, scared of being rejected by Will.

"I...I thought...I thought you liked me too."

Will's eyes showed his internal panic. "No! Nico. I do. I really like you." Nico smiled brightly at Will in that moment, brighter than he had in years, though his eyes had tears in them.

"I can't...I can't believe you're okay with...this." Nico blushed, giving Will a peck on the cheek. "I feel like I'm wrong, but you make me feel so right." Nico had no idea how he was forming his words so gracefully, but when Will smiled back at him, Nico didn't care.

"There is nothing wrong with you, Nico." Will kissed Nico, dipping the shorter boy as though the two were dancing.

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I have no clue if I'll continue this. I kind of made Will a good guy half way through because I hate/love evil Will. Maybe I'll rewrite. Maybe it will stay as-is. Hope you enjoyed either way.

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Updated to fix the errors in formatting! Hopefully it works now! Thank you to the reviewers who informed me of this!