After a price is agreed he can tell a very flowery (and somewhat lewd) dramatic romance! Youthful desires and hubris and furtive touching and longing hearts and rushing into things and contrived misunderstandings between the characters and authority figures who do not approve of the young couple one bit...
There's a tangle of different relationships and desires. Two men - Carlos (who is powerful and already married) and Raul (a young hard-working craftsman) - wanting the beautiful and rich Josa and competing for her attention, while Helena pines after Raul in the background. There are dramatic expressions of desire, elaborate gifts of jewelry and flowers, a duel between the romantic rivals, Josa's father forbidding her from seeing either of them (but there's no command magic, so she can disobey).
Carlos and Helena try to make it look like Raul betrayed Josa - Carlos so he can win her affection, but Helena because she still wants to be with Raul. But this gets cleared up. There's another duel, this time injuring Carlos.
In the end, it's Josa's choice who she will love. She picks Raul, who loves her with no ulterior motive and makes her laugh and is handsome, instead of the more selfish and scheming Carlos who mostly wants access to her family fortune. Carlos tries to have them arrested, but Josa and Raul flee the country on a boat and marry and go build a new life in America.
(There are pretty clearly social norms Mahan is not aware of and Valanda only dimly so, also 'marriage' is an official legal and usually permanent thing where he's from, not the casual version the most appropriate word he can find refers to here. He does his best to talk around them.)