Lancelot's own eyebrows are rather raised; he glances over at Lan Wangji. Is it the sparring as flirting thing, or something more?

He certainly is not going to share any details of his own sparring-as-foreplayflirting sessions with Magnus or Lan Wangji, and his own urge to tease Magnus seems mean-spirited in general, given present company. So instead he says, "That's well. Our sessions alone would not be enough practice to truly build your skills. I am glad that Alex is a help to you."