Veth might tease Fjord for his strength, but even she can't say anything bad about his cock. She's seen glimpses of it and she's frankly thirsty over it, how long and thick it is. But glimpses is all she's seen. Until one day she's creeping into Fjord's room to set up a prank and barely manages to hide as Fjord and Jester barge in, already groping at each other.

+ Non-consensual voyerism. They have no idea she's there.
+++Pegging. Maybe Fjord gets bent over a table or the bed. All the better for Veth to see his manhood.
+++Veth silently getting herself off.

-Fjord and Jester noticing her.