Stupid drawing is stupid, and yet I spent this much time on it.
The three most popular parings in the TF2 slash community at the moments.
It was supposed to be a little comic where Spy and Sniper complained about their arranged marriage (aka shared update") and arguing over who should wear the dress at the wedding, until Medic pointed out that neither of them had to wear it (Neither I nor Heavy wore a dress at our wedding"), he and Heavy obviously being the experts on the matter seeing as they got "paired off" long ago, and unlike the rest, it had noting to do with a shared update.
Then Soldier got upset because he thought that meant he couldnt wear a dress either. (It has long been a recurrent joke in the fandom that Soldiers mom wanted him to born a girl, which resulted in him getting a special relationship with womens clothes. This joke only became funnier when it was revealed that his real name is Jane). Medic said it would look stupid, but Demoman told Soldier that of course he could be his "bride". And so it all had a happy ending.
You know what? I think it was all just an excuse to draw Soldier in a wedding dress.