This will all be POVs but I will add in the vows for you and it's very short
Third POV
Barry was excited it was the day of his wedding he didn't really know how to feel he was of course excited but he was also nervous but there was one thing he always had on his mind and that was Caitlin and he now knows what everything in his was leading to this one moment but his future self did tell him he was also destined to be evil if continued down a certain path but Barry finally changed his life once again and he was thankful for his new life with the one person he truly loved since the day he go his speed and like Cisco said "speed and cold are opposites" and he remembers what he said to Felicity "opposites attract" and since he has speed and Caitlin has frost they were literally opposites of each other's powers and nothing will change the way he feels for her.
Barry's POV
Today's the wedding and I couldn't be any happier because Caitlin has become everything I have ever wanted and she makes me happier then I have ever felt with Iris and with us spending time together there is nothing we can do killer frost has become the best hero to everyone next to the flash but alot of the crime has dropped due to killer frost and now everything has been quiet and we get to spend more time together Cisco has finally had the nerve to ask out gypsy but of course they have their bad days but Cisco is thankful for her but there was still alot to plan out for everything and I don't know if I can be this happy ever again.
Third POV
As Barry and Caitlin were at the alter ready to be married they were both excited for this and now they can finally focus on how they can live their lives and start a family with each other. Barry was finally ready to live his new life as well as Caitlin since she started working with Barry at CCPD a few months ago and she was excited to have her Barry where ever she went.
Third POV
Caitlin vow
"Barry since the day we met everything changed for both of us and I know together we can accomplish anything we do whether it's as scientist or us just being us I love you Barry with all my heart".said Caitlin
"Caitlin from the day I got out of that coma was the day everything changed for me I have seen alot of great things in this life but nothing was as beautiful as you are I love you Caitlin with everything I have and it will always be you who always will be here for us no matter where we are I will always love you".said barry
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Snowbarry~An Unexpected Betrayal
Fanfictionwhat if Barry and Iris were dating for 3 years before he enters the speed force and 6 months later he realizes that Iris was dating someone else and he knew there was only one person he can trust and her name was Caitlin Snow/Killer Frost