Yes, but on a condition

She bit her lips, before visibly gaining courage.

"Aaron and I have been talking for a while. This family's willingness to let so many of their kinks be shown inspired me to tell him of my biggest. As weel as the one I've hidden since we started dating." She sucked in a heavy breath and held it. And she sighed explossively.

"We've talked about this a couple weeks before your birthday when Mom and Dad came to us with your gift," Aaron continued. He nudged his wife.

She nodded and looked me in the eye, "Aaron trusts you implicitly. He has a love for you and your sister far stronger than anything I've seen in a family. And so," her nerves began to take her again. She began fidgeting and biting at her lip until Aaron leaned in and whispered to her.

"You're right, dear. Thank you, my love," she said to her husband. She turned back to me and said, "I will listen to whatever you want, as long as, as, um... As long as you cuckold my husband."

Uh... How in the hell am I supposed to answer that!? Then again, I'd get to fuck her. Then again, she's my brother's wife... Then again, she's my brother's wife... Hooooo boy.