Getting to Know the Harbinger

Wager

They stood in the dining room kissing until they heard Lydia come back inside. They separated before Lydia walked in to see them, but she was still pretty quick to figure out what had been going on and apologized profusely for interrupting.

After dinner Lydia went to bed and Vilkas happily settled into the soft chair beside the hearth, pulling Kaya into his lap.
For a long while Vilkas simply sat happily, watching the fire with Kaya comfortably in his arms, thinking...
"You know love," he whispered with a smirk, "if we lend that amulet to my brother when we get back to Jorrvaskr, I'd wager we can take the whole Circle to Riften for a double wedding, this week."
Kaya smiled, "that sounds like a wonderful idea, my love."

When they returned to Jorrvaskr the next day, Vilkas was disappointed he hadn't managed to put any money on his wager, because he would have won.

The double wedding of Companions' Circle was an event the guards and most of Skyrim would no doubt be gossiping about for years. Vilkas thought it was almost a pity no one knew the Harbinger was also the Dragonborn... but he was content with their secrets... and he and his brother were definitely both very happy with their wives.