Nice: Allow her to use your dick...

"Kako, you really are a chore sometimes," you tell her as you keep on working her cock. You hike up your skirt in the front and pull the waistband of your red panties down under your cock.
"I know, but you get what you pay for!" Kako smiles down at you.
"Not always," you retort. "I paid a fraction of what the other models cost...and look how much cock I get! It puts out so much cum too; I would say I got the bargain of a lifetime!" When you go back to sucking her cockhead, you realize you can fit your tongue in her slit already; her climax is building. So you stand, take your own hard meat in your hand, and shove your dick up Kako's slit all the way to the hilt. She gasps, then smiles, then finally giggles. "I knew you wouldn't stay pissed at me for long! And what a reward! You are going to make me want to be difficult all the time!"
"Don't press your luck," you respond. You pull out a bit then thrust back in. Truth be told you were horny already; these new clothes look and feel great! You manage to hold back until Kako's cock starts trying to spew her goo before allowing yourself over the edge so your own hole opens and her creamy white fluid flows down your own tunnel. You feel your already tight panties stretching in the front. It does not get too bad, however.
"Yup, made the front very stretchy," Kako informs you. You smile at her as your balls fill out to about the size of Kako's. She smiles back as she finishes up.
"We could be twins," you tell her and she giggles a bit. "If only you weren't so flat in the chest and ass, that is," you finish slyly.
"My tits and ass are plenty big! Anyone would say so!" She looks a little miffed.
"Look at me! I wouldn't say so anymore!"
"Well, you look like a cow! You even have the milky udders!"
"I like my milky udders, and my ass is divine!" Your hands roam down and start working Kako's monster cock again.
"You big fat liar! You just like getting me worked up about you because you know it makes me want to...cuuummm!!!" There she goes again. You enjoy your moment as your crotch gets heavier and heavier. You know you can take at least one more load into you if you want to after this one, but you don't want your new panties dragging on the floor after your balls fill that much. So after her shoulders sag, you don't get her worked up again and pull your cock from hers. You look at your balls hanging down to your ankles still surrounded by that silky red panty material. You draw her attention to it as you put your cock away and let the hem of your skirt fall. The skirt hangs just slightly above the floor and hides even your expanded balls well. Kako puts herself away, too.
"Hey you really got a lot of precum soaked into those panties, don't you want to let them dry?" She just smiles sweetly.
"Are you trying to get me out of my panties, sir?" She looks on shyly. "I do have another to change into, but it wouldn't be proper!"