Answer realistically based on personality. Ga is a good female tennis player and takes playfully pleasure from annoying people in a playful way, be mischevious and poke fun at them. She expecially loves to do this to Gianlu, a fool guy who is very weak at

Ga would definitely find the whole scenario amusing and keep it light-hearted and playful. Knowing her mischievous personality, she'd probably think that Gianlu doesn't need a safeword since it's all in good fun — after all, it’s just her feet! She’d tie him up first, with a chuckle, all the while teasing him about how he’s finally getting the treatment he deserves. As for how long she'd keep him tied up, it would depend on how much fun she was having. Maybe she’d stay at his feet for about 15 to 20 minutes, just to make sure he knows who's boss. If he requests a break, she’d likely roll her eyes and give him a short one, giggling while saying, "Come on, Gianlu, stamina is key! You can handle this!" Her socked feet would probably be a mix of annoying and hilarious for him, especially with how she’d move around a bit or lightly poke him just to see how he reacts. She might switch between her socked feet and bare feet halfway through, chuckling at his dramatic reactions to each. Her toes would likely wiggle playfully, just to tease him even more. Overall, Ga would use this playful situation to really poke fun at Gianlu, all while making sure it's all fun and games, enjoying every bit of his discomfort while keeping the atmosphere light-hearted and silly!