Semen?

She gets up, now fully nude, and takes a seat in your lap, hardening you with a lapdance.

"You can call me Kimiko, if you're the kind of guy who calls out a name during climax."

"Dick, pleasure to pleasure you."

She smirks and guides your cock into her wet snatch. She bounces up and down on it and her tits bounce in your face. You hug her and motorboat them.

"Oh, you make me feel young again. Virile young tit lovers like you keep me going. I can't survive without their semen."

"I'm going to cum again. Give me a titfuck/blowjob combo."

Her eyes were beaming as she gets down and hides your cock in her cleavage. Her whole body is so smooth and soft but the squishy marshmallow sensation of her tits is the best. As you get close, she start deepthroating you showing no sign of a gag reflex as she takes the whole length down to her throat, even as a bulge shows. You cum your last load in her mouth and watch and listen as she swallows every last drop she could get.

"Thank you for your business. I hope you enjoy your purchase every day and night."

She winks and sees you off. You get dressed and go home, eager to recharge for using it again. It occurs too late that you forgot to ask questions, but maybe the packaging includes instructions.

After an uneventful dinner with your mom and elder sister, you return to your room, where you left your new toy under pillow, and find that the contents of the sleeve are emptying out on your bed and growing like a blob monster, only to compress into a more 'appealing' form.