Marin's first challenge

Accepting the challenge
First challenge becomes available as soon as you finish the Manor quest. If Marin is unavailable for interaction (likely because you didn't interrogate her during Manor quest), this can be "fixed" by using special trigger in her room.

Regardless of wether you apologised or not, she would offer you to pass her challenge for forgiveness. Once you accept it, you must wait one day, then visit her again.

She would demand you to put on special underwear she bought earlier before proceeding. Refusing, or trying to deceive her, would cancel the quest, requiring you to ask her again and this time, put it on after all. Unsurprisingly, this turns out to be a trap – the underwear is alive!

The trial
Regardless of outcome, Marin would offer to sell Living Underwear to you in the end, but price would change depending on how the trial went.

As soon as you agree to put underwear on, Marin would use them to demonstrate their power, instantly putting you to 50% arousal. After that, Marin would require you to service her. Quest wouldn't progress until you do so – or try to attack her.

The possible outcomes are following:
 * If you attack her, she would become angry, and activate the underwear in full force.
 * If you fail the battle, she would use the underwear to molest you, then let you buy them for $1000, since she bought them in the first place just to mess with you.
 * If you win the battle, you would put the living underwear on her, and leave her like this for another day. If you ask to buy the underwear after that, she would rise the price to $1200, due to being angry at you.
 * If you service her, you have options to do it properly, molest her, tickler her, or try to grab her clothes.
 * If you do what she asks, you would face the Nimble check, determining what you can or can't do.
 * If you do it poorly, you would enrage her, you would enrage her, resulting in you being punished. She would sell the underwear for $1000, since it was only bought to screw with you anyway.
 * If you do it adequately (Nim 6+ required), she wouldn't punish you, but she would comment what it was still not as satisfying as she thought it would be. She would sell the underwear for $1000.
 * If you do it well (Nim 12+ required), she would actually enjoy it. As reward, she would sell the underwear for $800, which is cheaper than she bought it herself.
 * If you try to molest her, she would use the flute to punish you. She would sell the underwear for $1000, since its sole purpose was to mess with you anyway.
 * If you try to tickle her, she would become angry, and immediately stop the challenge. She would sell the underwear for $1200 afterwards.
 * If you grab her clothes (and the flute with it), you have options to give clothes back, try to play randomly, or just attack Marin.
 * If you give clothes back as she demands, she would use the flute to punish you. However, she would agree to sell it for $1000, since she only bought it to mess with you.
 * If you try to play randomly, it wouldn't produce anything meaningful. She would remove living underwear, and would agree to sell it – for $1200, due to being angry at you.
 * If you attack her, the battle would initiate, except this time she wouldn't be able to use flute against you, making the battle much easier. Regardless of outcome, she would sell underwear for $1200, due to being angry at you.