Special Brew?

"Uh-oh. What are you doing Kako? Do you have your special brew?" You shiver at the thought of what Kako plans on doing to you, but you aren't certain if that is in fear or anticipation.
"Oh, whatever do you mean?" Kako asks as she leans into you.
"You know what I mean. The stuff that does this to me!" You slap your ass for emphasis.
"Don't make it sound like a bad thing! You were fine before, I just helped you help me! And well this batch wasn't intended for your butt, but if you are going to be presenting every time I get home, then serves you right!" She pulls back from you and then in a moment her crotch is grinding against you with determination. Likely she is fucking you but the stool has you propped open so wide you couldn't feel her enter! Before long she backs away again, and then a fleshy, sticky wet thing flops on top of your butt. You feel it shoot into the small of your back and run over your butt. Mostly it runs around and between your orbs then down your hips and thighs but she helps spread it around once she finishes. Your skirt gets a bit tighter.