"It's a promise"

Her eyes bore into his, emeralds clashing with his mismatched gaze. The silence was deafening, their breaths and pants were the only noise for god knows how long. Then she slowly raised her hand making him back away ever so slightly, but not far away enough. Never far away enough. Her middle and index fingers tapped his forehead gently as her lips formed a tender smile.
" I will always be by your side" her voice was almost a whisper, but somehow the words got to him as his mismatched eyes faded to black once again. " whether you want me there or not."

Takes place during the blank period, as Sasuke and Sakura travel together. Mostly canon, although I've taken the liberty to have Sasuke deactivate the Rinnegan the same way he does the Sharingan.