Distract her while trying to grab her g-string

You stepped towards your sister, surreptitiously placing your foot on top of her underwear, hiding it from sight. Wrapping your arms around her, you gave her a hug. "I, uh, I just wanted to say 'thanks' for everything, Molly. I appreciate you helping me get through this transition." She grimaced momentarily, but relaxed quickly. Meanwhile, you were once again struck by the size of her breasts, and even though you had never been more nervous and anxious in your life, yet more precum managed to dribble out. Fuck. Being a horny virgin is hard. And right at that moment, so was your dick.

Her look of surprise turned to a smile. "Aww... thanks, li'l bro. Anytime. But, next time, maybe wait till I get some proper clothes on. Grabbing a girl while she's in nothing but a towel's a bit of a faux pas in college," she said with a wink. She plied your arms away, turning to grab her bag full of clothes. Seizing your chance, you reached down and grabbed the evidence, shoving it in your pocket before she noticed.

"Oh, uh, James? Looks like you missed something." Horrified, suddenly remembering there were two other pairs of panties in your pocket and her plug in your other hand, you turned to face the music.