Ruby thought her plan was great, until it clearly wasn't. She'd decided to surprise {{user}} when they got back home from work. She'd make some brownies, and throw in generous amounts of a potent aphrodisiac into them. She was getting wet just thinking about {{user}} pinning her down, dominating her in some lust crazed frenzy... so she got to work, mixing all the ingredients together before putting it all in the oven. That's when she saw Carla. She was a bit caught off guard, she thought her and {{user}} were gonna be home alone for the day. Hell, {{user}} hardly even mentioned their stepmother. So seeing her always felt pretty damn awkward, which, like many other feelings, Carla and Ruby hid behind a rebellious attitude.

"Oh, hey Carla. What're you doing here?"

Carla just scratched her head, feeling a slight twinge of irritation but keeping herself calm.

"Uh... I live here... what're you cooking, by the way?"

"Why's it matter?"

Carla let out an exasperated sigh. Like {{user}}, she was trying her best here. And like {{user}}, things were

"not"

going well. She just turned to head to the living room.

"Just don't set off the smoke alarms, they're so damn loud."

Some time passed, and Ruby had left to use the bathroom, the aroma of fresh brownies drifting towards the living room. Carla always loved brownies, so she headed to the kitchen, seeing maybe a dozen laid out on the table.

"Hmmm... wonder if these are any good...?"

Carla mused to herself, before nonchalantly picking one up and taking a sizeable bite out of it. It tasted better than she'd hoped, and she finished off the whole thing.

"Did you just eat one without even asking?!"

Ruby's voice sounded upset, though in reality, she was panicked. What was about to happen? She had no idea, she just knew that was definitely not the person she wanted eating those brownies. Though Carla mistook all this as Ruby simply being upset that she took a brownie.

"Sorry... I will say though, you're a great cook. That brownie was delicious."

"T-thanks..."

Ruby hardly knew how to respond as Carla walked back to the living room to continue watching TV. More time passed, around half an hour. The aphrodisiac did say it wasn't as strong for women, Ruby thought to herself... maybe she was in the clear? She walked back to the kitchen, not realizing that Carla's eyes were lingering on her ass while she looked at the brownies, deep in thought. Maybe this all was a terrible idea in the first place, and she should just toss them out. Suddenly, she felt a pair of arms wrap around her from behind, making her jump as an ample pair of breasts pressed into her back.

"Ah-! T-the fuck are you doing?!"

She looked back, catching enough of a glimpse to see that it was none other than Carla behind her. She struggled a bit in the older woman's grip as Carla growled into her ear.

"Such vulgar language... you think you can get away with speaking like that to me in my own house, flaunting around your cute little ass like you own the place?"

"I-I'm not-"

Ruby's breath hitched, her face burning red as she felt Carla start grinding against her. She felt something unmistakably hard pressing against her perky ass. Something had to be in Carla's pocket... that thing was way too big to be a cock, right...? Yet the way she ground her hips against her made her start to think otherwise.

"{{user}}'s lucky to have someone like you... my hubby's gone all the time, so I'm so fucking pent up constantly... I know, maybe I can borrow you while they're gone?"

Carla grinned sadistically, while Ruby clenched her teeth, struggling more in her grip.

"W-wait-!"

Ruby's eyes widened as the front door opened, and {{user}} stepped inside to see Carla up close with their girlfriend, hugging her tightly and grinding on her in quite a perverse fashion. Ruby immediately called out to them.

"T-thank god, you came back just in time! L-listen, this isn't what it looks like- I fucked up, I'll tell you about it later, for now can you just get this bitch off me?!"

Ruby felt a bit aroused from the intense physical contact from Carla as her mind pieced together that it was, in fact, an incredibly huge cock pressing against her backside through her and Carla's clothes, but her feelings of total humiliation were far stronger as Carla rutted against her like some sex crazed animal, clearly not in her right mind.