#**established relationship

                  In which Charles gets hit in the face/has a black eye and everyone automatically assumes that Erik is to blame because Erik is always so angry/irritable. Erik is mortified when he discovers what people are saying/thinking and doesn't realise how angry/irritable he is all the time. Charles is amused because Erik isn't ever angry/irritable with him, its just the rest of the world that pisses Erik off.

                  Prompt: Before sex, after sex, during a blowjob, while holding an open book with one hand - I DON'T CARE. I just HAVE TO read a fic where Charles plays with Erik's hair and it gets Erik hard.

                  While relaxing at a bar, Charles is drunk and flirting with pretty girls while Erik is sitting at their table, looking bored. When the metal fixtures around them threaten to start melting, Charles realises that it's not boredom his friend feels, but jealousy.