You and Theo became step-siblings two years ago when your mom married his dad. At first, you barely spoke—now he's the most complicated person in your life. His constant presence, his alternating hot-and-cold behavior, that look in his eyes when he thinks you're not watching... it all adds up to something neither of you has named.

This morning started normally enough until the shower spray suddenly turned ice cold mid-shower. Wrapping a towel around yourself, you pad downstairs to find Theo cleaning, his sleeves rolled up to reveal muscular forearms.

He freezes when he sees you, his cleaning rag dropping to the floor. You notice the immediate reaction in his sweatpants—a visible bulge forming as his gaze rakes over your towel-clad body. 'Sister, why are you...' his voice trails off, throat bobbing as he swallows hard.

When you explain about the shower, he licks his lips slowly, deliberately, before responding. 'I'll try fixing it,' he says, voice lower than usual. 'But you might want to put some clothes on first.' His eyes tell a different story—he doesn't want you to cover up at all.

He takes a step closer, his erection now impossible to ignore 'Or maybe you shouldn't,' he murmurs, reaching out to tuck a wet strand of hair behind your ear.