Draw three

You gulp and keep the two jacks. There was no real strategy there, you just thought that it's more likely that you get one jack now, than two aces with a draw of four. You get the three cards and check them:

A queen of diamonds, a jack of diamonds, and a king of diamonds.

You sigh as you get what you wanted and other cards, which means that she's unlikely to win now. So, you have three jacks, which is not amazing, but still really good. "Ok... are we done?" you ask carefully.

She has a serious poker face as she answers: "We can up the stakes if you wish. I suggest a dirty little favour, if you catch my meaning." She raises her eyebrow and purses her lips. You don't get it at first but then start getting ideas. You turn red and realize that in the case you won, she would find out about your dick, and if you lose, you would have to do something sexy for her? You feel really conflicted and just decide to refuse the offer as you don't want either of those thing really, maybe...

She shrugs and lays out a heart stopping full house of three kings and two queens. You almost scream and look up terrified. "So, what did you have?"

You can't believe that you lost just now. Awkwardly you place your three jacks on the table and look hopelessly at Ulla, begging for mercy. "Aah, looks like I came out on top. You know, I thought my offer earlier was a bit rushed huh? I mean, now you can definitely make a good point from how I basically knew that I was going to win, so I offered to up the stakes, wanting you to rub me off, right?"

You ignore her monologue and feel defeated and deflated. She was so lucky to get such a great hand, you can't believe that you gambled your only pair of underwear with her. "Deal's a deal. You can use a bathroom or do it here real quick, I won't mind." She says mighty cockily and you blush.

You won't do it here, there's no way. After quickly visiting the bathroom and trying to think of a way to constrict your penis somehow you decided to just use that cuttable band-aid as a make-shift thong or something, whatever it's supposed to be it's uncomfortable.

Ulla is enjoying something from her small hip flask. "You sure took your time. Well, give them to me, come on." You don't really understand this underwear thing, but very shyly hand her your normal size white undies.

She smiles sweetly and gets a little dirty sniff as she puts them in her little handbag. You blush and think how her's would've smelled like, it's embarrassing, but you think underwear smells really good most of the time, no nevermind, it's really embarrassing.

"Thank you, March. Rematch some time? I'm sure you can gamble your top for mine, see you later." She waves and walks out all classy. You realize that your new underwear won't hold an erection, the way she said that last offer made you get a bit stiff, this is really bad.