Mark realized it first, they were on Skype and he was looking into Sean's blue eyes and listening to his laugh when he thought i want him to be mine all mine, but he said nothing.
Sean realized at pax, he saw Mark laughing with a fan and he got jealous. He tried to push his feelings away, telling him self he was just excited to finally met them and he didn't want others to take them away. But it came to him that the feelings are real. But he said nothing.
So their feelings went unsaid, And they both grew sad. Wade couldn't take it any longer, he couldn't stand seeing his best friend sad. He took out his laptop and Skype Sean, hoping he felt the same towards Mark. He told him about Marks feelings and Sean got quiet, Wade was scared this was bad news in till he heard Sean say " he really likes me" blushing a bit as well.
They arranged for Sean to come to LA to talk to Mark. He was terrified, even though wade had promised him that Mark really likes him, he was scared of rejection. When he got to LA Wade was waiting there for him, Wade was gonna drive him to Mark's house so they could talk.
When they got there Wade didn't get out leaving Sean there alone to talk to Mark. He went up to the door and knocked on it. Mark opened the door and was surprised to see Sean was the one who knocked, before he could say anything Sean said "we need to talk". Mark nodded and let him in wondering what was so important that he flew all the way here to say.
They sat on the couch and Sean looked at mark, not sure how to explain. Sean took a deep breath and told him about how Wade had told him that Mark had feelings for him. Mark got nervous not sure what Sean was gonna say next. All Sean said was "I like you too" and kissed him, softly putting his feelings into action. When they pulled apart Mark finally asked him the question he was during to ask him "will you be my boyfriend?" "Of course".