No. You swat Abbie's ass and tell her to get dressed so she can take you to school

You chuckle along with Mom at your sister’s teasing booty-shaking. You take a step towards her and swat her ass with a stinging SMACK! She bolts up straight, “Dave!” she gasps. Her eyes go wide and her chest heaves as she breathes heavily. “I wasn’t expecting that.” Her cheeks turn bright pink.

You shrug and give her a smirk. “If you’re gonna shake your ass at a guy, you should expect to get it spanked.” You chuckle. Abbie just nods.

You notice Mom is watching, and her face is flushed too. “You’ve been teasing your brother for so long, sweetheart, it was only a matter of time before he had enough and took action,” she chided Abbie. You wink at Mom.

“I don’t think I’m going to dare you to run around in public in just your panties and night shirt today, Abs,” you tell her in what you hope sounds like an authoritative voice. “Instead, why don’t you go get dressed, and then you can drive me to school.”

Abbie bites her lower lip and nods. She says, “OK, Dave,” in a soft voice and hurries up the stairs.

Once she’s gone, your mother moves to you and gives you a tight hug. “Looks like I’m not the only one around here who can benefit from a strong man's guiding hand. Seeing you and your sister like that… it gives me ideas, honey.” She presses her face into your chest and kisses it. “But… she’s not… like me, right? I forget. It’s not normal for me to think the way I do about you. I can’t imagine Abbie is… as depraved as I am.”

You bend your head down to kiss the top of your mom’s head, smelling her shampoo in her soft hair. “You’re not depraved, Mom. You’re a wonderful, loving woman,” you reassure her.

Your mom turns her face up towards you. “If you knew the things I think about you, you’d know just how depraved I am.” She says in a sly, sultry voice.

You laugh and kiss her softly on the lips. You can hear Abbie coming out of her room upstairs, so you both pull away from your embrace.

Abbie jogs down the stairs in a pair of tight daisy-duke shorts and a belly-shirt tank top with a low scooped neckline that shows off some cleavage and her toned midriff. The outlines of her nipples poking up under the thin fabric makes it clear she isn’t wearing a bra. “Reporting for chauffeur duty, Sir.” She says sarcastically.

“Great. Thanks, Abs.” Before you head out with Abbie, you kiss Mom on the cheek. “See you later. Have a great day at work. You should probably stay the whole day today. I bet they’ve been missing you there,” you tell her. Then you put an arm around Abbie as you head out the door.