Richtofen: You were fighting the undead with your boyfriend (BF/N). Richtofen had been looking for you and once he saw you with another guy he wasn't too happy. "Vat is zis feeling? Is zis... Jealousy?" He dismissed it as a random feeling and he walked over to you. "Hallo (Y/N). Who is zis?" He asked and (BF/N) came over to you and asked "Do you know him?" "Yes. This is Dr. Richtofen. Doctor this is (BF/N) my boyfriend." Upon hearing this Richtofen was angry. He didn't like the fact that you were taken. (BF/N) stuck out his hand and Richtofen looked at him. "Vat are you doing?" "Handshake?" Richtofen gave in and shook his hand but he still did not like this guy being near you. So he invited you to come and stay at his team's base camp and you accepted his offer. Time skip to later that night.
Richtofen was fairly suspicious of (BF/N) due to how you eagerly agreed to stay with him. So he stayed near your room when he heard you fighting with (BF/N) "I was just accepting his offer. That's all." You said calmly. "I don't care. Did you notice his uniform? Do you know what he is?! Well? Do you?" "Yeah I know. I saw his uniform. He's not a bad guy though." You answered defensively. "Then what is he then?" (BF/N) asked angrily. "A Nazi. Like I said before he's." That's all you could say before a slap was heard. "Stay away from him. He's dangerous to be around." Upon hearing this Richtofen was infuriated. Yes he was dangerous but he didn't want to hurt you. Oh no he wanted to hurt (BF/N) for what he did to you. It was then he promised that he would avenge you. Then he began plotting revenge.