I interrupt

You sit up abruptly, dislodging Megan from her straddling position. "Alright, that's enough," you say firmly, though your voice is strained. Your cock throbs painfully, still slick with Megan's arousal. "Becka, this is not appropriate. This is... this is my marriage. And you're my sister."

Becka's hand stills in her lap. Her expression shifts from heated reminiscence to something softer, almost apologetic. "Sorry, Dan. I got carried away. It's just... you two have always had this electric thing. It's hard not to watch."

Megan slides off you, her face flushed with a mix of arousal and embarrassment. "Yeah, well," you say, scrambling for the blanket, "we're not putting on a show tonight. So why don't you... go back to bed? Or go find Josh if you're so horny." The words come out sharper than you intended.

Becka's eyes flicker, something unreadable crossing her face. "Wow. Okay." She stands, her silhouette still mostly hidden in the shadows. "You know what? Maybe I will go find Josh. At least he doesn't have a stick up his ass."

She turns and leaves, the door clicking shut behind her with more force than necessary.

The room falls silent except for your heavy breathing.