Suspend the plus-sized girl.

You're going to need a lot of rope for this one. Strong rope, too. Luckily, there's a firm-looking signpost sticking out from the side of one of the nearby buildings. You can use that.

First, you deprive the blonde of her panties. You stick them in her mouth, so she can't make any more empty threats, and fix them there with rope. You hogtie her, lashing her wrists to her ankles and drawing them both together behind her back. Then you wrap her in a complex rope harness, supporting every part of her body. You pay special attention to the rough, knotted rope that's drawn tightly between her legs, pressing firmly between the lips of her pussy. It's going to hold a lot of weight, and you want it to be strong.

You dangle her from the signpost. It's not easy to get up there, but it's rewarding. She hangs vertically, unfastened hair falling loose down her muscular back, breasts bobbing up and down as she swings in the gentle breeze, looking out at the laughing crowd with panic in her eyes. She tries to shout something through her gag but it just comes out as muffled murmurs. You can tell from the way she struggles against her ropes that the crotchrope is making her uncomfortable in more way than one. She might as well get used to it, though. She won't be getting out of that for a while.

The first thrown tomato hits her between the breasts. It's extra-ripe and mushy, splattering juice across her chest. Her eyes grow wide as she figures out what the targets you painted on her tits are for.