It’s just so sad. All throughout the party all Mickey wants is to be able to go home later to Ian and forget about the whole day. And all Ian wants is for Mickey to finally accept who he is and who they are together. You can see in the second GIF a tear fall down Ian’s face and in the last GIF his hand is a bit shaky. Watching how Mickey is with his father as they celebrate his son’s birth almost seemed to make Ian break completely. And then Kev comes in like a shinning light in his silent way just telling Ian to hang in there.