Sherlock-

"My wonderful Sherlock, it is absolutely incomprehensible to me how we've gotten to this point, and yet, here we are. I vow to love you for all of your quirky and amazing traits, to be loyal to you and you only, to be patient when you're being a cocky git, and to be courteous to and not be jealous of your relationship with John for as long as we both shall live."

Mycroft-

"When first you walked into my bakery, I somehow knew you and I would have our fates intertwined. Do not contradict me; I was right on this. To you, my love, I vow to love you forever, to honour you in all that you do, to make as many cakes and goodies for you as possible, and to put up with your reluctant-to-be-sentimental self for all the days of our lives and beyond."

Moriarty-

"I promise to love you, protect you, please you, help you, and be with you forever. I promise to kill for you and kill with you. I will kill anyone who dares to mess with you. You're mine, by most importantly, I'm yours, and I will always be yours."

John-

"I will give you my word that I will love, cherish, honour, serve, and protect you at all costs, even if it doesn't seem like much. I will also be supportive of your endeavours with Sherlock, so long as you make it home for dinner. John Hamish Watson, this is my vow to you."

Greg-

"Dearest Graham—or was it George? Maybe Gavin? Gary perhaps? I'm honestly not sure—I vow to love you forever, to be your best friend, to be loyal until the end, and to honour you for the rest of my days. Gerard, you are the man of my dreams. I promise to you, Guillermo, that I will never leave you, and I will always be by your side. Greg—is that really your name? Geez!—I'm your girl, and you're my guy until the end."